U.S. patent application number 17/005009 was filed with the patent office on 2020-12-17 for uplink power control.
The applicant listed for this patent is IDAC Holdings, Inc.. Invention is credited to Virgil Comsa, Tao Deng, Paul Marinier, Ghyslain Pelletier, J. Patrick Tooher.
Application Number | 20200396694 17/005009 |
Document ID | / |
Family ID | 1000005051862 |
Filed Date | 2020-12-17 |
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United States Patent
Application |
20200396694 |
Kind Code |
A1 |
Comsa; Virgil ; et
al. |
December 17, 2020 |
UPLINK POWER CONTROL
Abstract
Techniques for uplink power control (e.g., for New Radio (NR))
are disclosed. A wireless transmit/receive unit (WTRU) may
determine that the WTRU is to perform a first and a second
transmissions using a first and a second transmission beams. The
WTRU may determine an uplink transmission power for one or more of
the first or second transmissions. For example, if the angular
separation of the first and the second transmission beams is
greater than a first separation threshold, the WTRU may determine
the uplink transmission power having a first maximum power level
parameter and a second maximum power level parameter. If the
angular separation of the first and the second transmission beams
is less than a second separation threshold, the WTRU determine the
uplink transmission power having a shared maximum power level
parameter. The WTRU may transmit the first and second transmissions
using the first and second transmission beams, respectively.
Inventors: |
Comsa; Virgil; (Montreal,
CA) ; Marinier; Paul; (Brossard, CA) ; Tooher;
J. Patrick; (Montreal, CA) ; Deng; Tao;
(Roslyn, NY) ; Pelletier; Ghyslain; (Montreal,
CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
IDAC Holdings, Inc. |
Wilmington |
DE |
US |
|
|
Family ID: |
1000005051862 |
Appl. No.: |
17/005009 |
Filed: |
August 27, 2020 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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16336968 |
Mar 27, 2019 |
10764832 |
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PCT/US17/53360 |
Sep 26, 2017 |
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17005009 |
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62401009 |
Sep 28, 2016 |
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62474955 |
Mar 22, 2017 |
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62500809 |
May 3, 2017 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04W 52/146 20130101;
H04W 52/265 20130101; H04W 52/367 20130101; H04B 7/0408 20130101;
H04W 52/365 20130101; H04W 52/281 20130101; H04B 7/0404
20130101 |
International
Class: |
H04W 52/14 20060101
H04W052/14; H04B 7/0404 20060101 H04B007/0404; H04B 7/0408 20060101
H04B007/0408; H04W 52/26 20060101 H04W052/26; H04W 52/28 20060101
H04W052/28; H04W 52/36 20060101 H04W052/36 |
Claims
1. A wireless transmit/receive unit (WTRU) that comprises: a
processor, configured to: determine that the WTRU is to performed a
first transmission using a first transmission beam and a second
transmission using a second transmission beam; determine an uplink
transmission power for one or more of the first or second
transmissions, wherein: on a condition that an angular separation
of the first and second transmission beams is greater than a first
separation threshold, determine the uplink transmission power based
on the first transmission associated with the first transmission
beam having a first maximum power level parameter and the second
transmission associated with the second transmission beam having a
second maximum power level parameter, and on a condition that an
angular separation of the first and second transmission beams is
less than a second separation threshold, determine the uplink
transmission power based on the first transmission associated with
the first transmission beam and the second transmission associated
with the second transmission beam having a shared maximum power
level parameter; and transmit the first transmission using the
first transmission beam and the second transmission using the
second transmission beam.
2. The WTRU of claim 1, wherein the processor is further configured
to determine the angular separation of the first and second
transmission beams based on one or more of an angular distance,
directional correlation, or spatial separation of the first and
second transmission beams.
3. The WTRU of claim 1, wherein one or more of the first maximum
power level parameter, the second maximum power level parameter, or
the shared maximum power level parameter comprises a configured
maximum transmitted power (Pcmax), wherein the Pcmax is based on
one or more of a maximum gain or a maximum effective isotropic
radiated power (EIRP).
4. The WTRU of claim 1, wherein on a condition that the determined
uplink transmission power for one or more of the first or second
transmissions exceed a maximum allowed power, perform power scaling
of one or more of the first or second transmission beams based on a
priority order.
5. The WTRU of claim 4, wherein the priority order for performing
the power scaling of one or more of the first or second
transmission beams is based on one or more of a numerology
parameter, or property of the first or second transmission beam
that comprises one or more of a duration, waveform used, or type of
transmission.
6. The WTRU of claim 1, wherein the shared uplink transmission
power level parameter comprises an EIRP level parameter, the
processor is further configured to: determine available power
associated with the first transmission beam; and on a condition
that a EIRP threshold value is exceeded when the second
transmission beam is transmitted with the first transmission beam,
perform power allocation on one or more of the first or second
transmission beams.
7. The WTRU of claim 6, wherein performing the power allocation,
the processor is configured to scale one or more of the first or
second transmission beams to satisfy the EIRP threshold value
associated with the uplink transmission power.
8. The WTRU of claim 7, wherein scaling one or more of the first or
second transmission beams are based on one or more of the Pcmax, a
total power of on-going transmission of the second transmission, or
a guaranteed power of the second transmission.
9. The WTRU of claim 6, wherein performing the power allocation,
the processor is further configured to: determine a required
transmission power of the first and second transmission beams;
calculate a normalized required transmission power associated with
the required transmission power of the first and second
transmission beams; and perform the power allocation of the first
and second transmission beams based on the calculated normalized
required transmission power.
10. The WTRU of claim 1, wherein the first separation threshold and
the second separation threshold have a same value.
11. A method comprising: a processor, configured to: determining
that a wireless transmit/receive unit (WTRU) is to performed a
first transmission using a first transmission beam, a second
transmission using a second transmission beam, a third transmission
using a third transmission beam, or a fourth transmission using a
fourth transmission beam; determining an uplink transmission power
for one or more of the first, second, third, or fourth
transmissions, wherein: on a condition that an angular separation
of the first and second transmission beams is greater than a first
separation threshold, determining the uplink transmission power
based on the first transmission associated with the first
transmission beam having a first maximum power level parameter and
the second transmission associated with the second transmission
beam having a second maximum power level parameter, and on a
condition that an angular separation of the third and fourth
transmission beams is less than a second separation threshold,
determining the uplink transmission power based on the third
transmission associated with the third transmission beam and the
fourth transmission associated with the fourth transmission beam
having a shared maximum power level parameter; and transmitting one
or more of the first transmission using the first transmission
beam, the second transmission using the second transmission beam,
the third transmission using the third transmission beam, or the
fourth transmission using the fourth transmission beam.
12. The method claim 11, wherein determining the angular separation
of the first and second transmission beams or the third and fourth
transmission beams is based on one or more of an angular distance,
directional correlation, or spatial separation between the first
and second transmission beams or the third and fourth transmission
beams.
13. The method claim 11, wherein one or more of the first maximum
power level parameter, the second maximum power level parameter, or
the shared maximum power level parameter comprises a configured
maximum transmitted power (Pcmax), wherein the Pcmax is based on
one or more of a maximum gain or a maximum effective isotropic
radiated power (EIRP).
14. The method claim 11, wherein on a condition that the determined
uplink transmission power for one or more of the first, second,
third, or fourth transmissions exceeds a maximum allowed power,
performing power scaling of one or more of the first, second,
third, or fourth transmission beams based on a priority order.
15. The method claim 14, wherein the priority order for performing
the power scaling of one or more of the first, second, third, or
fourth transmission beams is based on one or more of a numerology
parameter, or property of the first, second, third, or fourth
transmission beams that comprises one or more of a duration,
waveform used, or type of transmission.
16. The method claim 11, wherein the shared uplink transmission
power level parameter comprises an EIRP level parameter, the method
further comprising: determining available power associated with the
first or third transmission beam; and on a condition that a EIRP
threshold value is exceeded when the second or fourth transmission
beam is transmitted with the first or third transmission beam
respectively, performing power allocation on one or more of the
first, second, third, or fourth transmission beams.
17. The method claim 16, wherein performing the power allocation
comprising: configuring to scale one or more of the first, second,
third, or fourth transmission beams to satisfy the EIRP threshold
value associated with the uplink transmission power.
18. The method claim 17, wherein scaling one or more of the first,
second, third, or fourth transmission beams are based on one or
more of the Pcmax, a total power of on-going transmission of the
second or fourth transmission, or a guaranteed power of the second
or fourth transmission.
19. The method of claim 16, wherein performing the power
allocation, the method further comprising: determining a required
transmission power of one or more of the first, second, third, and
fourth transmission beams; calculating a normalized required
transmission power associated with the required transmission power
of one or more of the first, second, third, and fourth transmission
beams; and performing the power allocation of one or more of the
first, second, third, and fourth transmission beams based on the
calculated normalized required transmission power.
20. The method of claim 11, wherein the first separation threshold
and the second separation threshold have a same value.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of U.S. Provisional
Application Ser. No. 62/401,009 filed Sep. 28, 2016, U.S.
Provisional Application Ser. No. 62/474,955 filed Mar. 22, 2017,
and U.S. Provisional Application Ser. No. 62/500,809 filed May 3,
2017, the contents of which are incorporated by reference
herein.
BACKGROUND
[0002] Mobile communications continue to evolve. A fifth generation
may be referred to as 5G, which may implement an advanced wireless
communication system called New Radio (NR).
SUMMARY
[0003] Systems, methods, and instrumentalities are disclosed for
uplink power control, e.g., for New Radio (NR) by a wireless
transmit/receive unit (WTRU). A WTRU may determine that the WTRU is
to perform a first transmission using a first transmission beam and
a second transmission using a second transmission beam. A WTRU may
determine an uplink transmission power for one or more of the first
or second transmissions.
[0004] In examples, a WTRU may determine an angular separation of
the first and second transmission beams. For example, a WTRU may
determine an angular separation between the first and second
transmission beams based on one or more of an angular distance,
directional correlation, or spatial separation of the first and
second transmission beams. When an angular separation of the first
and second transmission beams is greater than a first separation
threshold, a WTRU may determine the uplink transmission power based
on the first transmission associated with the first transmission
beam having a first maximum power level parameter and the second
transmission associated with the second transmission beam having a
second maximum power level parameter.
[0005] When an angular separation of the first and second
transmission beams is less than a second separation threshold, a
WTRU determine the uplink transmission power based on the first
transmission associated with the first transmission beam and the
second transmission associated with the second transmission beam
having a shared maximum power level parameter. The first separation
threshold and the second separation threshold may have a same
value.
[0006] One or more of the determined first maximum power level
parameter, the second maximum power level parameter, or the shared
maximum power level parameter may include a configured maximum
transmitted power (P.sub.CMAX), wherein the P.sub.CMAX may be based
on one or more of a maximum gain or a maximum effective isotropic
radiated power (EIRP).
[0007] A WTRU may transmit the first transmission using the first
transmission beam and the second transmission using the second
transmission beam. When the determined uplink transmission power
for one or more of the first or second transmissions exceed a
maximum allowed power, a WTRU may perform power scaling of one or
more of the first or second transmission beams based on a priority
order. The priority order for performing the power scaling of one
or more of the first or second transmission beams may be based on
one or more of a numerology parameter, or property of the first or
second transmission beam that may include one or more of a
duration, waveform used, or type of transmission.
[0008] The determined shared uplink transmission power level
parameter may include an EIRP level parameter. A WTRU may determine
available power associated with the first transmission beam. When a
EIRP threshold value exceeds when the second transmission beam is
transmitted with the first transmission beam, a WTRU may perform
power allocation on one or more of the first or second transmission
beams. When performing the power allocation, a WTRU may, for
example, scale one or more of the first or second transmission
beams to satisfy the EIRP threshold value associated with the
uplink transmission power. Scaling one or more of the first or
second transmission beams may be based on one or more of the
P.sub.CMAX, a total power of on-going transmission of the second
transmission, or a guaranteed power of the second transmission.
When performing the power allocation, a WTRU may, for example,
determine a required transmission power of the first and second
transmission beams. A WTRU may calculate a normalized required
transmission power associated with the required transmission power
of the first and second transmission beams. A WTRU may perform the
power allocation of the first and second transmission beams based
on the calculated normalized required transmission power.
[0009] A WTRU may be configured to perform power control for uplink
transmissions with multiplexed numerologies, beamforming and
related signaling. For example, the WTRU may perform uplink power
control based on one or more of the following: power allocation
rules, priorities, dependency on numerology, multiplexed
numerologies, interference (e.g., victim nodes), beamforming,
and/or uplink power control related signaling. Power allocation may
be dependent on numerology. Power allocation with multiple
numerologies may consider a maximum digital-to-analog converter
(DAC) dynamic range and/or a maximum configured power. Power
applicable to transmissions may be guaranteed. Power allocation for
transmission may use multiple beams with P.sub.CMAX configured per
direction. Resource selection may be power-aware. Priority rules
may be applicable to transmissions using multiple numerologies
and/or beams. Power may be allocated based on the presence of
unintended receivers (e.g., victim nodes). Power headroom reports
may be triggered and/or calculated with multiple numerologies.
Power limitations may be signaled with multiplexed numerologies. In
certain applications, power sharing may not exceed EIRP
requirements (e.g., based on coupling parameters). Uplink power
control may use multiple waveforms. Power sharing and/or scaling
determination may be used for normalized transmission powers (e.g.,
to handle scenarios with multiple configured maximum total
powers).
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1A is a system diagram illustrating an example
communications system in which one or more disclosed embodiments
may be implemented.
[0011] FIG. 1B is a system diagram illustrating an example wireless
transmit/receive unit (WTRU) that may be used within the
communications system illustrated in FIG. 1A according to an
embodiment.
[0012] FIG. 1C is a system diagram illustrating an example radio
access network (RAN) and an example core network (CN) that may be
used within the communications system illustrated in FIG. 1A
according to an embodiment.
[0013] FIG. 1D is a system diagram illustrating a further example
RAN and a further example CN that may be used within the
communications system illustrated in FIG. 1A according to an
embodiment.
[0014] FIG. 2 illustrates an example of transmission over multiple
numerology blocks using a radio frequency (RF) chain.
[0015] FIG. 3 illustrates an example of beams in different
subsets.
[0016] FIG. 4 illustrates an example of beams in the same
subset.
DETAILED DESCRIPTION
[0017] A detailed description of illustrative embodiments will now
be described with reference to the various Figures. Although this
description provides a detailed example of possible
implementations, it should be noted that the details are intended
to be exemplary and in no way limit the scope of the
application.
[0018] FIG. 1A is a diagram illustrating an example communications
system 100 in which one or more disclosed embodiments may be
implemented. The communications system 100 may be a multiple access
system that provides content, such as voice, data, video,
messaging, broadcast, etc., to multiple wireless users. The
communications system 100 may enable multiple wireless users to
access such content through the sharing of system resources,
including wireless bandwidth. For example, the communications
systems 100 may employ one or more channel access methods, such as
code division multiple access (CDMA), time division multiple access
(TDMA), frequency division multiple access (FDMA), orthogonal FDMA
(OFDMA), single-carrier FDMA (SC-FDMA), zero-tail unique-word
DFT-Spread OFDM (ZT UW DTS-s OFDM), unique word OFDM (UW-OFDM),
resource block-filtered OFDM, filter bank multicarrier (FBMC), and
the like.
[0019] As shown in FIG. 1A, the communications system 100 may
include wireless transmit/receive units (WTRUs) 102a, 102b, 102c,
102d, a RAN 104/113, a CN 106/115, a public switched telephone
network (PSTN) 108, the Internet 110, and other networks 112,
though it will be appreciated that the disclosed embodiments
contemplate any number of WTRUs, base stations, networks, and/or
network elements. Each of the WTRUs 102a, 102b, 102c, 102d may be
any type of device configured to operate and/or communicate in a
wireless environment. By way of example, the WTRUs 102a, 102b,
102c, 102d, any of which may be referred to as a "station" and/or a
"STA", may be configured to transmit and/or receive wireless
signals and may include a user equipment (UE), a mobile station, a
fixed or mobile subscriber unit, a subscription-based unit, a
pager, a cellular telephone, a personal digital assistant (PDA), a
smartphone, a laptop, a netbook, a personal computer, a wireless
sensor, a hotspot or Mi-Fi device, an Internet of Things (IoT)
device, a watch or other wearable, a head-mounted display (HMD), a
vehicle, a drone, a medical device and applications (e.g., remote
surgery), an industrial device and applications (e.g., a robot
and/or other wireless devices operating in an industrial and/or an
automated processing chain contexts), a consumer electronics
device, a device operating on commercial and/or industrial wireless
networks, and the like. Any of the WTRUs 102a, 102b, 102c and 102d
may be interchangeably referred to as a UE.
[0020] The communications systems 100 may also include a base
station 114a and/or a base station 114b. Each of the base stations
114a, 114b may be any type of device configured to wirelessly
interface with at least one of the WTRUs 102a, 102b, 102c, 102d to
facilitate access to one or more communication networks, such as
the CN 106/115, the Internet 110, and/or the other networks 112. By
way of example, the base stations 114a, 114b may be a base
transceiver station (BTS), a Node-B, an eNode B, a Home Node B, a
Home eNode B, a gNB, a NR NodeB, a site controller, an access point
(AP), a wireless router, and the like. While the base stations
114a, 114b are each depicted as a single element, it will be
appreciated that the base stations 114a, 114b may include any
number of interconnected base stations and/or network elements.
[0021] The base station 114a may be part of the RAN 104/113, which
may also include other base stations and/or network elements (not
shown), such as a base station controller (BSC), a radio network
controller (RNC), relay nodes, etc. The base station 114a and/or
the base station 114b may be configured to transmit and/or receive
wireless signals on one or more carrier frequencies, which may be
referred to as a cell (not shown). These frequencies may be in
licensed spectrum, unlicensed spectrum, or a combination of
licensed and unlicensed spectrum. A cell may provide coverage for a
wireless service to a specific geographical area that may be
relatively fixed or that may change over time. The cell may further
be divided into cell sectors. For example, the cell associated with
the base station 114a may be divided into three sectors. Thus, in
one embodiment, the base station 114a may include three
transceivers, i.e., one for each sector of the cell. In an
embodiment, the base station 114a may employ multiple-input
multiple output (MIMO) technology and may utilize multiple
transceivers for each sector of the cell. For example, beamforming
may be used to transmit and/or receive signals in desired spatial
directions.
[0022] The base stations 114a, 114b may communicate with one or
more of the WTRUs 102a, 102b, 102c, 102d over an air interface 116,
which may be any suitable wireless communication link (e.g., radio
frequency (RF), microwave, centimeter wave, micrometer wave,
infrared (IR), ultraviolet (UV), visible light, etc.). The air
interface 116 may be established using any suitable radio access
technology (RAT).
[0023] More specifically, as noted above, the communications system
100 may be a multiple access system and may employ one or more
channel access schemes, such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA,
and the like. For example, the base station 114a in the RAN 104/113
and the WTRUs 102a, 102b, 102c may implement a radio technology
such as Universal Mobile Telecommunications System (UMTS)
Terrestrial Radio Access (UTRA), which may establish the air
interface 115/116/117 using wideband CDMA (WCDMA). WCDMA may
include communication protocols such as High-Speed Packet Access
(HSPA) and/or Evolved HSPA (HSPA+). HSPA may include High-Speed
Downlink (DL) Packet Access (HSDPA) and/or High-Speed UL Packet
Access (HSUPA).
[0024] In an embodiment, the base station 114a and the WTRUs 102a,
102b, 102c may implement a radio technology such as Evolved UMTS
Terrestrial Radio Access (E-UTRA), which may establish the air
interface 116 using Long Term Evolution (LTE) and/or LTE-Advanced
(LTE-A) and/or LTE-Advanced Pro (LTE-A Pro).
[0025] In an embodiment, the base station 114a and the WTRUs 102a,
102b, 102c may implement a radio technology such as NR Radio
Access, which may establish the air interface 116 using New Radio
(NR).
[0026] In an embodiment, the base station 114a and the WTRUs 102a,
102b, 102c may implement multiple radio access technologies. For
example, the base station 114a and the WTRUs 102a, 102b, 102c may
implement LTE radio access and NR radio access together, for
instance using dual connectivity (DC) principles. Thus, the air
interface utilized by WTRUs 102a, 102b, 102c may be characterized
by multiple types of radio access technologies and/or transmissions
sent to/from multiple types of base stations (e.g., a eNB and a
gNB).
[0027] In other embodiments, the base station 114a and the WTRUs
102a, 102b, 102c may implement radio technologies such as IEEE
802.11 (i.e., Wireless Fidelity (WiFi), IEEE 802.16 (i.e.,
Worldwide Interoperability for Microwave Access (WiMAX)), CDMA2000,
CDMA2000 1.times., CDMA2000 EV-DO, Interim Standard 2000 (IS-2000),
Interim Standard 95 (IS-95), Interim Standard 856 (IS-856), Global
System for Mobile communications (GSM), Enhanced Data rates for GSM
Evolution (EDGE), GSM EDGE (GERAN), and the like.
[0028] The base station 114b in FIG. 1A may be a wireless router,
Home Node B, Home eNode B, or access point, for example, and may
utilize any suitable RAT for facilitating wireless connectivity in
a localized area, such as a place of business, a home, a vehicle, a
campus, an industrial facility, an air corridor (e.g., for use by
drones), a roadway, and the like. In one embodiment, the base
station 114b and the WTRUs 102c, 102d may implement a radio
technology such as IEEE 802.11 to establish a wireless local area
network (WLAN). In an embodiment, the base station 114b and the
WTRUs 102c, 102d may implement a radio technology such as IEEE
802.15 to establish a wireless personal area network (WPAN). In yet
another embodiment, the base station 114b and the WTRUs 102c, 102d
may utilize a cellular-based RAT (e.g., WCDMA, CDMA2000, GSM, LTE,
LTE-A, LTE-A Pro, NR etc.) to establish a picocell or femtocell. As
shown in FIG. 1A, the base station 114b may have a direct
connection to the Internet 110. Thus, the base station 114b may not
be required to access the Internet 110 via the CN 106/115.
[0029] The RAN 104/113 may be in communication with the CN 106/115,
which may be any type of network configured to provide voice, data,
applications, and/or voice over internet protocol (VoIP) services
to one or more of the WTRUs 102a, 102b, 102c, 102d. The data may
have varying quality of service (QoS) requirements, such as
differing throughput requirements, latency requirements, error
tolerance requirements, reliability requirements, data throughput
requirements, mobility requirements, and the like. The CN 106/115
may provide call control, billing services, mobile location-based
services, pre-paid calling, Internet connectivity, video
distribution, etc., and/or perform high-level security functions,
such as user authentication. Although not shown in FIG. 1A, it will
be appreciated that the RAN 104/113 and/or the CN 106/115 may be in
direct or indirect communication with other RANs that employ the
same RAT as the RAN 104/113 or a different RAT. For example, in
addition to being connected to the RAN 104/113, which may be
utilizing a NR radio technology, the CN 106/115 may also be in
communication with another RAN (not shown) employing a GSM, UMTS,
CDMA 2000, WiMAX, E-UTRA, or WiFi radio technology.
[0030] The CN 106/115 may also serve as a gateway for the WTRUs
102a, 102b, 102c, 102d to access the PSTN 108, the Internet 110,
and/or the other networks 112. The PSTN 108 may include
circuit-switched telephone networks that provide plain old
telephone service (POTS). The Internet 110 may include a global
system of interconnected computer networks and devices that use
common communication protocols, such as the transmission control
protocol (TCP), user datagram protocol (UDP) and/or the internet
protocol (IP) in the TCP/IP internet protocol suite. The networks
112 may include wired and/or wireless communications networks owned
and/or operated by other service providers. For example, the
networks 112 may include another CN connected to one or more RANs,
which may employ the same RAT as the RAN 104/113 or a different
RAT.
[0031] Some or all of the WTRUs 102a, 102b, 102c, 102d in the
communications system 100 may include multi-mode capabilities
(e.g., the WTRUs 102a, 102b, 102c, 102d may include multiple
transceivers for communicating with different wireless networks
over different wireless links). For example, the WTRU 102c shown in
FIG. 1A may be configured to communicate with the base station
114a, which may employ a cellular-based radio technology, and with
the base station 114b, which may employ an IEEE 802 radio
technology.
[0032] FIG. 1B is a system diagram illustrating an example WTRU
102. As shown in FIG. 1B, the WTRU 102 may include a processor 118,
a transceiver 120, a transmit/receive element 122, a
speaker/microphone 124, a keypad 126, a display/touchpad 128,
non-removable memory 130, removable memory 132, a power source 134,
a global positioning system (GPS) chipset 136, and/or other
peripherals 138, among others. It will be appreciated that the WTRU
102 may include any sub-combination of the foregoing elements while
remaining consistent with an embodiment.
[0033] The processor 118 may be a general purpose processor, a
special purpose processor, a conventional processor, a digital
signal processor (DSP), a plurality of microprocessors, one or more
microprocessors in association with a DSP core, a controller, a
microcontroller, Application Specific Integrated Circuits (ASICs),
Field Programmable Gate Arrays (FPGAs) circuits, any other type of
integrated circuit (IC), a state machine, and the like. The
processor 118 may perform signal coding, data processing, power
control, input/output processing, and/or any other functionality
that enables the WTRU 102 to operate in a wireless environment. The
processor 118 may be coupled to the transceiver 120, which may be
coupled to the transmit/receive element 122. While FIG. 1B depicts
the processor 118 and the transceiver 120 as separate components,
it will be appreciated that the processor 118 and the transceiver
120 may be integrated together in an electronic package or
chip.
[0034] The transmit/receive element 122 may be configured to
transmit signals to, or receive signals from, a base station (e.g.,
the base station 114a) over the air interface 116. For example, in
one embodiment, the transmit/receive element 122 may be an antenna
configured to transmit and/or receive RF signals. In an embodiment,
the transmit/receive element 122 may be an emitter/detector
configured to transmit and/or receive IR, UV, or visible light
signals, for example. In yet another embodiment, the
transmit/receive element 122 may be configured to transmit and/or
receive both RF and light signals. It will be appreciated that the
transmit/receive element 122 may be configured to transmit and/or
receive any combination of wireless signals.
[0035] Although the transmit/receive element 122 is depicted in
FIG. 1B as a single element, the WTRU 102 may include any number of
transmit/receive elements 122. More specifically, the WTRU 102 may
employ MIMO technology. Thus, in one embodiment, the WTRU 102 may
include two or more transmit/receive elements 122 (e.g., multiple
antennas) for transmitting and receiving wireless signals over the
air interface 116.
[0036] The transceiver 120 may be configured to modulate the
signals that are to be transmitted by the transmit/receive element
122 and to demodulate the signals that are received by the
transmit/receive element 122. As noted above, the WTRU 102 may have
multi-mode capabilities. Thus, the transceiver 120 may include
multiple transceivers for enabling the WTRU 102 to communicate via
multiple RATs, such as NR and IEEE 802.11, for example.
[0037] The processor 118 of the WTRU 102 may be coupled to, and may
receive user input data from, the speaker/microphone 124, the
keypad 126, and/or the display/touchpad 128 (e.g., a liquid crystal
display (LCD) display unit or organic light-emitting diode (OLED)
display unit). The processor 118 may also output user data to the
speaker/microphone 124, the keypad 126, and/or the display/touchpad
128. In addition, the processor 118 may access information from,
and store data in, any type of suitable memory, such as the
non-removable memory 130 and/or the removable memory 132. The
non-removable memory 130 may include random-access memory (RAM),
read-only memory (ROM), a hard disk, or any other type of memory
storage device. The removable memory 132 may include a subscriber
identity module (SIM) card, a memory stick, a secure digital (SD)
memory card, and the like. In other embodiments, the processor 118
may access information from, and store data in, memory that is not
physically located on the WTRU 102, such as on a server or a home
computer (not shown).
[0038] The processor 118 may receive power from the power source
134, and may be configured to distribute and/or control the power
to the other components in the WTRU 102. The power source 134 may
be any suitable device for powering the WTRU 102. For example, the
power source 134 may include one or more dry cell batteries (e.g.,
nickel-cadmium (NiCd), nickel-zinc (NiZn), nickel metal hydride
(NiMH), lithium-ion (Li-ion), etc.), solar cells, fuel cells, and
the like.
[0039] The processor 118 may also be coupled to the GPS chipset
136, which may be configured to provide location information (e.g.,
longitude and latitude) regarding the current location of the WTRU
102. In addition to, or in lieu of, the information from the GPS
chipset 136, the WTRU 102 may receive location information over the
air interface 116 from a base station (e.g., base stations 114a,
114b) and/or determine its location based on the timing of the
signals being received from two or more nearby base stations. It
will be appreciated that the WTRU 102 may acquire location
information by way of any suitable location-determination method
while remaining consistent with an embodiment.
[0040] The processor 118 may further be coupled to other
peripherals 138, which may include one or more software and/or
hardware modules that provide additional features, functionality
and/or wired or wireless connectivity. For example, the peripherals
138 may include an accelerometer, an e-compass, a satellite
transceiver, a digital camera (for photographs and/or video), a
universal serial bus (USB) port, a vibration device, a television
transceiver, a hands free headset, a Bluetooth.RTM. module, a
frequency modulated (FM) radio unit, a digital music player, a
media player, a video game player module, an Internet browser, a
Virtual Reality and/or Augmented Reality (VR/AR) device, an
activity tracker, and the like. The peripherals 138 may include one
or more sensors, the sensors may be one or more of a gyroscope, an
accelerometer, a hall effect sensor, a magnetometer, an orientation
sensor, a proximity sensor, a temperature sensor, a time sensor; a
geolocation sensor; an altimeter, a light sensor, a touch sensor, a
magnetometer, a barometer, a gesture sensor, a biometric sensor,
and/or a humidity sensor.
[0041] The WTRU 102 may include a full duplex radio for which
transmission and reception of some or all of the signals (e.g.,
associated with particular subframes for both the UL (e.g., for
transmission) and downlink (e.g., for reception) may be concurrent
and/or simultaneous. The full duplex radio may include an
interference management unit to reduce and or substantially
eliminate self-interference via either hardware (e.g., a choke) or
signal processing via a processor (e.g., a separate processor (not
shown) or via processor 118). In an embodiment, the WRTU 102 may
include a half-duplex radio for which transmission and reception of
some or all of the signals (e.g., associated with particular
subframes for either the UL (e.g., for transmission) or the
downlink (e.g., for reception)).
[0042] FIG. 1C is a system diagram illustrating the RAN 104 and the
CN 106 according to an embodiment. As noted above, the RAN 104 may
employ an E-UTRA radio technology to communicate with the WTRUs
102a, 102b, 102c over the air interface 116. The RAN 104 may also
be in communication with the CN 106.
[0043] The RAN 104 may include eNode-Bs 160a, 160b, 160c, though it
will be appreciated that the RAN 104 may include any number of
eNode-Bs while remaining consistent with an embodiment. The
eNode-Bs 160a, 160b, 160c may each include one or more transceivers
for communicating with the WTRUs 102a, 102b, 102c over the air
interface 116. In one embodiment, the eNode-Bs 160a, 160b, 160c may
implement MIMO technology. Thus, the eNode-B 160a, for example, may
use multiple antennas to transmit wireless signals to, and/or
receive wireless signals from, the WTRU 102a.
[0044] Each of the eNode-Bs 160a, 160b, 160c may be associated with
a particular cell (not shown) and may be configured to handle radio
resource management decisions, handover decisions, scheduling of
users in the UL and/or DL, and the like. As shown in FIG. 1C, the
eNode-Bs 160a, 160b, 160c may communicate with one another over an
X2 interface.
[0045] The CN 106 shown in FIG. 1C may include a mobility
management entity (MME) 162, a serving gateway (SGW) 164, and a
packet data network (PDN) gateway (or PGW) 166. While each of the
foregoing elements are depicted as part of the CN 106, it will be
appreciated that any of these elements may be owned and/or operated
by an entity other than the CN operator.
[0046] The MME 162 may be connected to each of the eNode-Bs 162a,
162b, 162c in the RAN 104 via an S1 interface and may serve as a
control node. For example, the MME 162 may be responsible for
authenticating users of the WTRUs 102a, 102b, 102c, bearer
activation/deactivation, selecting a particular serving gateway
during an initial attach of the WTRUs 102a, 102b, 102c, and the
like. The MME 162 may provide a control plane function for
switching between the RAN 104 and other RANs (not shown) that
employ other radio technologies, such as GSM and/or WCDMA.
[0047] The SGW 164 may be connected to each of the eNode Bs 160a,
160b, 160c in the RAN 104 via the S1 interface. The SGW 164 may
generally route and forward user data packets to/from the WTRUs
102a, 102b, 102c. The SGW 164 may perform other functions, such as
anchoring user planes during inter-eNode B handovers, triggering
paging when DL data is available for the WTRUs 102a, 102b, 102c,
managing and storing contexts of the WTRUs 102a, 102b, 102c, and
the like.
[0048] The SGW 164 may be connected to the PGW 166, which may
provide the WTRUs 102a, 102b, 102c with access to packet-switched
networks, such as the Internet 110, to facilitate communications
between the WTRUs 102a, 102b, 102c and IP-enabled devices.
[0049] The CN 106 may facilitate communications with other
networks. For example, the CN 106 may provide the WTRUs 102a, 102b,
102c with access to circuit-switched networks, such as the PSTN
108, to facilitate communications between the WTRUs 102a, 102b,
102c and traditional land-line communications devices. For example,
the CN 106 may include, or may communicate with, an IP gateway
(e.g., an IP multimedia subsystem (IMS) server) that serves as an
interface between the CN 106 and the PSTN 108. In addition, the CN
106 may provide the WTRUs 102a, 102b, 102c with access to the other
networks 112, which may include other wired and/or wireless
networks that are owned and/or operated by other service
providers.
[0050] Although the WTRU is described in FIGS. 1A-1D as a wireless
terminal, it is contemplated that in certain representative
embodiments that such a terminal may use (e.g., temporarily or
permanently) wired communication interfaces with the communication
network.
[0051] In representative embodiments, the other network 112 may be
a WLAN.
[0052] A WLAN in Infrastructure Basic Service Set (BSS) mode may
have an Access Point (AP) for the BSS and one or more stations
(STAs) associated with the AP. The AP may have an access or an
interface to a Distribution System (DS) or another type of
wired/wireless network that carries traffic in to and/or out of the
BSS. Traffic to STAs that originates from outside the BSS may
arrive through the AP and may be delivered to the STAs. Traffic
originating from STAs to destinations outside the BSS may be sent
to the AP to be delivered to respective destinations. Traffic
between STAs within the BSS may be sent through the AP, for
example, where the source STA may send traffic to the AP and the AP
may deliver the traffic to the destination STA. The traffic between
STAs within a BSS may be considered and/or referred to as
peer-to-peer traffic. The peer-to-peer traffic may be sent between
(e.g., directly between) the source and destination STAs with a
direct link setup (DLS). In certain representative embodiments, the
DLS may use an 802.11e DLS or an 802.11z tunneled DLS (TDLS). A
WLAN using an Independent BSS (IBSS) mode may not have an AP, and
the STAs (e.g., all of the STAs) within or using the IBSS may
communicate directly with each other. The IBSS mode of
communication may sometimes be referred to herein as an "ad-hoc"
mode of communication.
[0053] When using the 802.11ac infrastructure mode of operation or
a similar mode of operations, the AP may transmit a beacon on a
fixed channel, such as a primary channel. The primary channel may
be a fixed width (e.g., 20 MHz wide bandwidth) or a dynamically set
width via signaling. The primary channel may be the operating
channel of the BSS and may be used by the STAs to establish a
connection with the AP. In certain representative embodiments,
Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)
may be implemented, for example in 802.11 systems. For CSMA/CA, the
STAs (e.g., every STA), including the AP, may sense the primary
channel. If the primary channel is sensed/detected and/or
determined to be busy by a particular STA, the particular STA may
back off. One STA (e.g., only one station) may transmit at any
given time in a given BSS.
[0054] High Throughput (HT) STAs may use a 40 MHz wide channel for
communication, for example, via a combination of the primary 20 MHz
channel with an adjacent or nonadjacent 20 MHz channel to form a 40
MHz wide channel.
[0055] Very High Throughput (VHT) STAs may support 20 MHz, 40 MHz,
80 MHz, and/or 160 MHz wide channels. The 40 MHz, and/or 80 MHz,
channels may be formed by combining contiguous 20 MHz channels. A
160 MHz channel may be formed by combining 8 contiguous 20 MHz
channels, or by combining two non-contiguous 80 MHz channels, which
may be referred to as an 80+80 configuration. For the 80+80
configuration, the data, after channel encoding, may be passed
through a segment parser that may divide the data into two streams.
Inverse Fast Fourier Transform (IFFT) processing, and time domain
processing, may be done on each stream separately. The streams may
be mapped on to the two 80 MHz channels, and the data may be
transmitted by a transmitting STA. At the receiver of the receiving
STA, the above described operation for the 80+80 configuration may
be reversed, and the combined data may be sent to the Medium Access
Control (MAC).
[0056] Sub 1 GHz modes of operation are supported by 802.11af and
802.11ah. The channel operating bandwidths, and carriers, are
reduced in 802.11af and 802.11ah relative to those used in 802.11n,
and 802.11ac. 802.11af supports 5 MHz, 10 MHz and 20 MHz bandwidths
in the TV White Space (TVWS) spectrum, and 802.11ah supports 1 MHz,
2 MHz, 4 MHz, 8 MHz, and 16 MHz bandwidths using non-TVWS spectrum.
According to a representative embodiment, 802.11ah may support
Meter Type Control/Machine-Type Communications, such as MTC devices
in a macro coverage area. MTC devices may have certain
capabilities, for example, limited capabilities including support
for (e.g., only support for) certain and/or limited bandwidths. The
MTC devices may include a battery with a battery life above a
threshold (e.g., to maintain a very long battery life).
[0057] WLAN systems, which may support multiple channels, and
channel bandwidths, such as 802.11n, 802.11ac, 802.11af, and
802.11ah, include a channel which may be designated as the primary
channel. The primary channel may have a bandwidth equal to the
largest common operating bandwidth supported by all STAs in the
BSS. The bandwidth of the primary channel may be set and/or limited
by a STA, from among all STAs in operating in a BSS, which supports
the smallest bandwidth operating mode. In the example of 802.11ah,
the primary channel may be 1 MHz wide for STAs (e.g., MTC type
devices) that support (e.g., only support) a 1 MHz mode, even if
the AP, and other STAs in the BSS support 2 MHz, 4 MHz, 8 MHz, 16
MHz, and/or other channel bandwidth operating modes. Carrier
sensing and/or Network Allocation Vector (NAV) settings may depend
on the status of the primary channel. If the primary channel is
busy, for example, due to a STA (which supports only a 1 MHz
operating mode), transmitting to the AP, the entire available
frequency bands may be considered busy even though a majority of
the frequency bands remains idle and may be available.
[0058] In the United States, the available frequency bands, which
may be used by 802.11ah, are from 902 MHz to 928 MHz. In Korea, the
available frequency bands are from 917.5 MHz to 923.5 MHz. In
Japan, the available frequency bands are from 916.5 MHz to 927.5
MHz. The total bandwidth available for 802.11ah is 6 MHz to 26 MHz
depending on the country code.
[0059] FIG. 1D is a system diagram illustrating the RAN 113 and the
CN 115 according to an embodiment. As noted above, the RAN 113 may
employ an NR radio technology to communicate with the WTRUs 102a,
102b, 102c over the air interface 116. The RAN 113 may also be in
communication with the CN 115.
[0060] The RAN 113 may include gNBs 180a, 180b, 180c, though it
will be appreciated that the RAN 113 may include any number of gNBs
while remaining consistent with an embodiment. The gNBs 180a, 180b,
180c may each include one or more transceivers for communicating
with the WTRUs 102a, 102b, 102c over the air interface 116. In one
embodiment, the gNBs 180a, 180b, 180c may implement MIMO
technology. For example, gNBs 180a, 108b may utilize beamforming to
transmit signals to and/or receive signals from the gNBs 180a,
180b, 180c. Thus, the gNB 180a, for example, may use multiple
antennas to transmit wireless signals to, and/or receive wireless
signals from, the WTRU 102a. In an embodiment, the gNBs 180a, 180b,
180c may implement carrier aggregation technology. For example, the
gNB 180a may transmit multiple component carriers to the WTRU 102a
(not shown). A subset of these component carriers may be on
unlicensed spectrum while the remaining component carriers may be
on licensed spectrum. In an embodiment, the gNBs 180a, 180b, 180c
may implement Coordinated Multi-Point (CoMP) technology. For
example, WTRU 102a may receive coordinated transmissions from gNB
180a and gNB 180b (and/or gNB 180c).
[0061] The WTRUs 102a, 102b, 102c may communicate with gNBs 180a,
180b, 180c using transmissions associated with a scalable
numerology. For example, the OFDM symbol spacing and/or OFDM
subcarrier spacing may vary for different transmissions, different
cells, and/or different portions of the wireless transmission
spectrum. The WTRUs 102a, 102b, 102c may communicate with gNBs
180a, 180b, 180c using subframe or transmission time intervals
(TTIs) of various or scalable lengths (e.g., containing varying
number of OFDM symbols and/or lasting varying lengths of absolute
time).
[0062] The gNBs 180a, 180b, 180c may be configured to communicate
with the WTRUs 102a, 102b, 102c in a standalone configuration
and/or a non-standalone configuration. In the standalone
configuration, WTRUs 102a, 102b, 102c may communicate with gNBs
180a, 180b, 180c without also accessing other RANs (e.g., such as
eNode-Bs 160a, 160b, 160c). In the standalone configuration, WTRUs
102a, 102b, 102c may utilize one or more of gNBs 180a, 180b, 180c
as a mobility anchor point. In the standalone configuration, WTRUs
102a, 102b, 102c may communicate with gNBs 180a, 180b, 180c using
signals in an unlicensed band. In a non-standalone configuration
WTRUs 102a, 102b, 102c may communicate with/connect to gNBs 180a,
180b, 180c while also communicating with/connecting to another RAN
such as eNode-Bs 160a, 160b, 160c. For example, WTRUs 102a, 102b,
102c may implement DC principles to communicate with one or more
gNBs 180a, 180b, 180c and one or more eNode-Bs 160a, 160b, 160c
substantially simultaneously. In the non-standalone configuration,
eNode-Bs 160a, 160b, 160c may serve as a mobility anchor for WTRUs
102a, 102b, 102c and gNBs 180a, 180b, 180c may provide additional
coverage and/or throughput for servicing WTRUs 102a, 102b,
102c.
[0063] Each of the gNBs 180a, 180b, 180c may be associated with a
particular cell (not shown) and may be configured to handle radio
resource management decisions, handover decisions, scheduling of
users in the UL and/or DL, support of network slicing, dual
connectivity, interworking between NR and E-UTRA, routing of user
plane data towards User Plane Function (UPF) 184a, 184b, routing of
control plane information towards Access and Mobility Management
Function (AMF) 182a, 182b and the like. As shown in FIG. 1D, the
gNBs 180a, 180b, 180c may communicate with one another over an Xn
interface.
[0064] The CN 115 shown in FIG. 1D may include at least one AMF
182a, 182b, at least one UPF 184a,184b, at least one Session
Management Function (SMF) 183a, 183b, and possibly a Data Network
(DN) 185a, 185b. While each of the foregoing elements are depicted
as part of the CN 115, it will be appreciated that any of these
elements may be owned and/or operated by an entity other than the
CN operator.
[0065] The AMF 182a, 182b may be connected to one or more of the
gNBs 180a, 180b, 180c in the RAN 113 via an N2 interface and may
serve as a control node. For example, the AMF 182a, 182b may be
responsible for authenticating users of the WTRUs 102a, 102b, 102c,
support for network slicing (e.g., handling of different PDU
sessions with different requirements), selecting a particular SMF
183a, 183b, management of the registration area, termination of NAS
signaling, mobility management, and the like. Network slicing may
be used by the AMF 182a, 182b in order to customize CN support for
WTRUs 102a, 102b, 102c based on the types of services being
utilized WTRUs 102a, 102b, 102c. For example, different network
slices may be established for different use cases such as services
relying on ultra-reliable low latency (URLLC) access, services
relying on enhanced massive mobile broadband (eMBB) access,
services for machine type communication (MTC) access, and/or the
like. The AMF 162 may provide a control plane function for
switching between the RAN 113 and other RANs (not shown) that
employ other radio technologies, such as LTE, LTE-A, LTE-A Pro,
and/or non-3GPP access technologies such as WiFi.
[0066] The SMF 183a, 183b may be connected to an AMF 182a, 182b in
the CN 115 via an N11 interface. The SMF 183a, 183b may also be
connected to a UPF 184a, 184b in the CN 115 via an N4 interface.
The SMF 183a, 183b may select and control the UPF 184a, 184b and
configure the routing of traffic through the UPF 184a, 184b. The
SMF 183a, 183b may perform other functions, such as managing and
allocating UE IP address, managing PDU sessions, controlling policy
enforcement and QoS, providing downlink data notifications, and the
like. A PDU session type may be IP-based, non-IP based,
Ethernet-based, and the like.
[0067] The UPF 184a, 184b may be connected to one or more of the
gNBs 180a, 180b, 180c in the RAN 113 via an N3 interface, which may
provide the WTRUs 102a, 102b, 102c with access to packet-switched
networks, such as the Internet 110, to facilitate communications
between the WTRUs 102a, 102b, 102c and IP-enabled devices. The UPF
184, 184b may perform other functions, such as routing and
forwarding packets, enforcing user plane policies, supporting
multi-homed PDU sessions, handling user plane QoS, buffering
downlink packets, providing mobility anchoring, and the like.
[0068] The CN 115 may facilitate communications with other
networks. For example, the CN 115 may include, or may communicate
with, an IP gateway (e.g., an IP multimedia subsystem (IMS) server)
that serves as an interface between the CN 115 and the PSTN 108. In
addition, the CN 115 may provide the WTRUs 102a, 102b, 102c with
access to the other networks 112, which may include other wired
and/or wireless networks that are owned and/or operated by other
service providers. In one embodiment, the WTRUs 102a, 102b, 102c
may be connected to a local Data Network (DN) 185a, 185b through
the UPF 184a, 184b via the N3 interface to the UPF 184a, 184b and
an N6 interface between the UPF 184a, 184b and the DN 185a,
185b.
[0069] In view of FIGS. 1A-1D, and the corresponding description of
FIGS. 1A-1D, one or more, or all, of the functions described herein
with regard to one or more of: WTRU 102a-d, Base Station 114a-b,
eNode-B 160a-c, MME 162, SGW 164, PGW 166, gNB 180a-c, AMF 182a-b,
UPF 184a-b, SMF 183a-b, DN 185a-b, and/or any other device(s)
described herein, may be performed by one or more emulation devices
(not shown). The emulation devices may be one or more devices
configured to emulate one or more, or all, of the functions
described herein. For example, the emulation devices may be used to
test other devices and/or to simulate network and/or WTRU
functions.
[0070] The emulation devices may be designed to implement one or
more tests of other devices in a lab environment and/or in an
operator network environment. For example, the one or more
emulation devices may perform the one or more, or all, functions
while being fully or partially implemented and/or deployed as part
of a wired and/or wireless communication network in order to test
other devices within the communication network. The one or more
emulation devices may perform the one or more, or all, functions
while being temporarily implemented/deployed as part of a wired
and/or wireless communication network. The emulation device may be
directly coupled to another device for purposes of testing and/or
may performing testing using over-the-air wireless
communications.
[0071] The one or more emulation devices may perform the one or
more, including all, functions while not being implemented/deployed
as part of a wired and/or wireless communication network. For
example, the emulation devices may be utilized in a testing
scenario in a testing laboratory and/or a non-deployed (e.g.,
testing) wired and/or wireless communication network in order to
implement testing of one or more components. The one or more
emulation devices may be test equipment. Direct RF coupling and/or
wireless communications via RF circuitry (e.g., which may include
one or more antennas) may be used by the emulation devices to
transmit and/or receive data.
[0072] A next generation of wireless systems is referred to as New
Radio (NR). NR access technology may support a number of use cases,
such as enhanced Mobile Broadband (eMBB), ultra-high reliability
and low latency communications (URLLC), and/or massive machine type
communications (mMTC). Each use case may have its own set of
requirements of spectral efficiency, low latency, and/or massive
connectivity, for example.
[0073] A cellular wireless system (e.g., NR) may involve an uplink
(UL) power control mechanism for power allocation, uplink link
adaptation, and/or interference mitigation, e.g., for
coexistence.
[0074] NR may support carrier aggregation (CA) and/or dual
connectivity (DC). NR (e.g., in a DC configuration) may be
implemented as a secondary cell or as aggregated cells in
conjunction with a LTE cell or aggregated cells. This scenario may
be referred to as non-standalone (NSA) NR operation. NR may be an
anchor in DC, which may involve standalone operation (SA).
[0075] NR may support operation with more than one subcarrier
spacing value. Values may be derived from 15 kHz, for example, by
multiplication or division by a power of 2. Such operation may be
referred to as scalable numerology.
[0076] A WTRU may have a reference numerology in a given NR
carrier. For example, a WTRU may have one reference numerology in a
given NR carrier. A reference numerology may define the duration
for a carrier. For example, a reference numerology may define the
duration of a subframe for a carrier.
[0077] The duration of a subframe (e.g., in NR) for a reference
numerology with subcarrier spacing (2.sup.m*15) kHz may be
1/2.sup.m ms.
[0078] NR may support multiplexing numerologies in time and/or
frequency within a subframe or across subframes, e.g., from a WTRU
perspective.
[0079] A slot may have a duration of a number y of OFDM symbols in
numerology used for a transmission. An integer number of slots may
fit within a (e.g., one) subframe duration, for example, when
subcarrier spacing may be larger than or equal to that of reference
numerology. A mini-slot may be a transmission shorter than y OFDM
symbols.
[0080] Use cases for NR UL power control may include, for example,
one or more of the following: (i) standalone NR single carrier
operation (e.g., with single numerology or multiplexed numerology);
(ii) NR carrier aggregation multiplexed numerology (e.g., in the
same carrier or in different carriers that may be in the same band
or in different bands); and/or (iii) NR in DC with different
numerologies.
[0081] A WTRU may make a power allocation decision. For example, a
WTRU may make a power allocation decision for each transmission
time unit. A WTRU may make a power allocation decision that may
take into consideration, for example, of one or more of the
following factors: (i) pathloss measurements and/or estimation;
(ii) UL grant(s) received from the network; (iii) unscheduled or
grant-less transmission (e.g., for URLLC transmission); (iv)
whether there may be an ongoing transmission on a configured
carrier or numerology for a corresponding transmission time unit;
(v) how a WTRU may make resource selections based on available
power; (vi) beamforming related information; and/or (vii) whether
there may be different types of concurrent transmissions that may
be served simultaneously. Concurrent transmissions may lead to one
or more determinations (e.g., by a WTRU) about prioritization in
power allocation, for example, for different cases on each carrier,
across carriers, across multiplexed numerologies, and/or across
services (e.g., URLLC and/or eMBB).
[0082] Power allocation may be determined for a SA NR single
carrier mode. For example, power allocation may be determined for a
SA NR single carrier mode with single or multiplexed numerologies
in frequency and/or time domain. One or more numerologies
multiplexed in a carrier (e.g., single carrier) in a frequency
division multiplexing (FDM) or time division multiplexing (TDM)
mode may have different requirements (e.g., eMBB versus URLLC).
[0083] Power allocations may be determined for SA NR carrier
aggregation (CA) or DC that may be generic for numerologies,
multiplexed numerologies and specific.
[0084] One or more rules and/or triggers may be defined for power
control related signaling (e.g., power headroom report) or power
limited signaling.
[0085] One or more examples as described herein may be presented in
the context of a 5G wireless system (e.g., NR). Subject matter
discussed herein may be presented as an example and may be
applicable to other systems. Subject matter may be used in any part
or whole, separately or in combination and in any order or
reordering in a wide variety of implementations (e.g., to other
systems).
[0086] Power allocation may be dependent on numerology and/or one
or more waveforms. In examples, power allocation for a transmission
may be adjusted to be proportional to a subcarrier spacing value or
waveform used for the transmission. This may be realized, for
example, by introducing a term such as 10 log.sub.10 (N.sub.i,c) in
a power allocation formula. N.sub.i,c may be a ratio between a
subcarrier carrier spacing (SCS) value that may be used for a
transmission (e.g., SCS.sub.i,c) and a reference subcarrier spacing
(e.g., SCS.sub.ref). Reference subcarrier spacing may be, for
example, 15 kHz. This example approach may provide a power spectrum
density at a receiver that may remain constant over possible
subcarrier spacing values for a given number of physical resource
blocks. In examples, power allocation may be given by Eq. 1
P x , i , c ( q ) = min { P CMAX , i , c ( q ) , 10 log 10 ( M x ,
i , c ( q ) ) + 10 log 10 ( N i , c ) + P O _ x _ ic ( q ) +
.alpha. i , c PL i , c + .DELTA. TF , i , c ( q ) + f i , c ( q )
Eq . 1 ##EQU00001##
[0087] Index `x` may refer to a type of transmission (e.g., uplink
physical channel such as physical uplink shared channel (PUSCH),
uplink sounding signal such as sound reference signal (SRS), or
uplink demodulation reference signal such as DM-RS. Index `i` may
refer to a block of resources using the same numerology (e.g., a
numerology block) or a spectrum operating mode (SOM). Index `c` may
refer to a cell, hypercell, or a carrier. Index `q` may refer to a
specific time interval such as a subframe, slot, or mini-slot.
[0088] An offset value may depend on the waveform and/or subcarrier
spacing, which may achieve an adjustment in power allocation.
[0089] Parameter P.sub.CMAX,i,c(q) may refer to a configured
maximum transmission power in cell c for numerology block i in time
interval q. In examples, parameter P.sub.CMAX,i,c(q) may be
dependent on a beam direction, beam process, and/or a waveform.
[0090] Parameters P.sub.0_x_i,c(q), .alpha..sub.i,c, and/or
.DELTA..sub.TFi,c(q) may be configured by higher layers, for
example, for each cell c, each numerology block i and/or for each
waveform, and/or for each type of transmission x. One or more
parameters, described herein, may be interpreted, for example,
similar to LTE.
[0091] Parameter f.sub.i,c(q) may correspond to a transmit power
control command that may be received from downlink control
information applicable to a transmission. In examples, parameter
f.sub.i,c(q) may be similar or identical for one or more (e.g.,
all) numerology blocks i. In examples, parameter f.sub.i,c(q) may
be applicable (e.g., only applicable) for some numerology blocks i
and/or some waveforms.
[0092] Parameter PL.sub.i,c may correspond to a path loss estimate
associated with a cell and/or a numerology block, which may be
based on measurements taken on a reference signal and/or based on
an assumed transmission power (e.g., cell- and/or
numerology-block-specific) that may be configured by higher layers.
The WTRU may be configured to determine the resources used for an
applicable reference signal. For example, resources for an
applicable reference signal may be provided to the WTRU
semi-statically (e.g., via a configuration). For example, resources
for an applicable reference signal may be provided dynamically
(e.g., via downlink control information).
[0093] In examples, power allocation for a transmission may be a
function of a frequency allocation of a transmission that may be
expressed as a number M.sub.ref of physical resource blocks of a
reference subcarrier spacing, such as 15 kHz. For example, a
transmission using a subcarrier spacing of 60 kHz may have a
frequency allocation of M physical resource blocks for a subcarrier
spacing of 60 kHz. This may be equivalent to a frequency allocation
of M.sub.ref=(60/15) M=4 M in reference numerology. In examples,
power allocation (e.g., using an example approach described herein)
may be given by Eq. 2:
P x , i , c ( q ) = min { P CMAX , i , c ( q ) , 10 log 10 ( M Ref
, x , ic ( q ) ) + P O _ x _ ic ( q ) + .alpha. i , c PL i , c +
.DELTA. TFi , c ( q ) + f i , c ( q ) } Eq . 2 ##EQU00002##
[0094] Power allocation may depend on waveform. A WTRU may be
configured to transmit using one or more of multiple waveforms
(e.g., cyclic prefix-orthogonal frequency-division multiplexing
(CP-OFDM), and/or SC-FDMA). The WTRU may be indicated to use a
waveform for an UL transmission using one or more of the following:
an indication in an UL grant (e.g., the indication of waveform type
may be included in the UL grant); and/or a semi-static
configuration.
[0095] The WTRU may select a waveform type by using one or more of
the following: (i) control channel type used for UL grant (e.g.,
some parameters of a control channel (e.g., frequency location,
numerology, and/or beam) used for granting UL resources may be tied
to specific waveforms); (ii) search space tied to waveforms; (iii)
a type of UL transmission (e.g., a scheduled UL transmission may
use a first waveform, and a non-scheduled (e.g., grant-free) UL
transmission may use a second waveform, and/or a contiguous
allocation may use a first waveform, whereas a non-contiguous
allocation may use a second waveform); (iv) a service type (e.g.,
URLLC transmission may use a different waveform than eMBB); (v) a
retransmission number (e.g., a first transmission may use a first
waveform, whereas a retransmission may use a second waveform); (vi)
a beam process ID; and/or (vii) a physical channel (e.g., a PUSCH
may use a first waveform, and a long physical uplink control
channel (PUCCH) (e.g., a PUCCH spanning multiple symbols) may use a
second waveform, and a short PUCCH (e.g., a PUCCH using one or two
symbols) may use a third waveform).
[0096] A WTRU may determine that the WTRU may change waveforms used
for UL transmission. The triggers used for changing waveform type
may include selection of a waveform type as described herein and/or
one or more of the following: (i) channel characteristics (e.g.,
the pathloss value may be used by the WTRU to determine the
waveform to be used); and/or (ii) determination based on available
power for each waveform type.
[0097] A WTRU may indicate to the network that the WTRU has
determined that it may change the waveform using one or more of the
following: (i) by transmitting a power headroom report (PHR) report
for one or more waveform types as described herein; (ii) by
transmitting a buffer status (e.g., indicating that a WTRU may have
little remaining data in its buffer and may tolerate latencies
associated with waveforms having larger coding gain (e.g., smaller
transport block sizes) due to power limitations); and/or (iii) by a
feedback report that may include a preferred waveform type (e.g.,
including measurements (e.g., channel characteristics) to enable
the network to determine an optimal waveform).
[0098] A WTRU may transmit using multiple waveforms. For example, a
WTRU may transmit using multiple waveforms simultaneously. The
power control parameters as discussed herein may be applicable per
group of transmissions and/or categorized by waveform used. For
example, one or more (e.g., all) transmissions using SC-FDMA type
may be governed by one or more power control formulas using a first
set of parameters, and one or more (e.g., all) transmissions using
CP-OFDM may be governed by one or more power control formulas using
a second set of parameters. The parameters used for each waveform
may be specific to the case of multiple simultaneous waveform
transmissions.
[0099] The parameter P.sub.CMAX,i,c(q) may refer to the configured
maximum transmission power in cell c for numerology block i in time
interval q and may depend on a waveform used. The parameters (e.g.,
P.sub.CMAX,i,c(q), waveform specific offset, and/or compensation
coefficient .alpha..sub.i,c) for each waveform may depend on
whether there are simultaneous transmissions using multiple
waveforms. The parameters may depend on the relative size of each
waveform's total allocation. For example, the P.sub.CMAX,i,c(q)
values used for simultaneous transmissions of a first and second
waveform may be based on the assumption of same sized allocation.
Any divergence from that may lead to scaling the P.sub.CMAX,i,c(q)
values used for transmissions of each waveform (e.g., scaled up for
a larger relative allocation and scaled down for a smaller relative
allocation). For example, the scaling may be a function of the
relative allocations and/or the absolute allocations of each
waveform type.
[0100] A waveform may use non-contiguous transmissions (e.g.,
transmissions over blocks of non-adjacent physical resource blocks
(PRBs)). A block of contiguous PRBs may have a (e.g., specific) set
of parameters (e.g., P.sub.CMAX,i,c(q), waveform specific offset,
and/or compensation coefficient .alpha..sub.i,c values). The
appropriate parameters to use may depend on the location of the
block within the over-all user and/or carrier spectrum. The
parameter values may depend on the number and/or location of
simultaneous non-contiguous blocks (e.g., of the same or different
waveform). For example, a first set of parameters may be used
per-block (e.g., under the assumption that n non-contiguous blocks
are transmitted). A second set of parameters per-block may be used
to determine the power of the (e.g., remaining) n-x non-contiguous
blocks to be transmitted (e.g., if a priority rule determines that
x blocks are to be dropped).
[0101] The transmit power control (TPC) command (e.g., f.sub.i,c(q)
in the power control formula described herein) may be waveform
specific. A WTRU may maintain one or more loops, e.g., one per
waveform and/or beam. A TPC command may be used to indicate (e.g.,
dynamically indicate) a switch of waveforms. Waveforms may enable
higher transmission power. For example, when a WTRU receives a TPC
command that pushes the WTRU beyond the transmit power capabilities
of a first waveform, the WTRU may use a second waveform that has
remaining power available. The WTRU may indicate to the network
that it has switched or that the WTRU will switch to a different
waveform type.
[0102] The power control loop may be maintained over the use of one
or more different waveforms. A TPC command leading to a waveform
switch may reset some values of the closed-loop power control. For
example, the accumulated TPC command may lead to an increase (e.g.,
continuous increase) in transmission power (e.g., until the
waveform is switched dynamically and the transmission power is
reset to a lower value). TPC commands (e.g., future commands) may
act on the new reset value and/or new waveform type.
[0103] Power allocation with multiple numerologies may consider a
maximum DAC dynamic range and/or maximum configured power. In
examples, a transmission may use resources of one or more
numerology block i during a time interval q. This may be realized,
for example, using a (e.g., single) RF chain (e.g., as shown in an
example illustrated in FIG. 2) or using more than one RF chain.
[0104] Power allocated to a (e.g., each) numerology block may be
adjusted, for example, through multiplicative factors (e.g., g1
and/or g2) in baseband and/or additional or alternative
multiplicative factors in RF. In examples, multiplicative factors
may be a function of subcarrier spacing of a corresponding block.
For example, g1 and g2 may be proportional to subcarrier spacing
used for first and second numerology blocks and may be inversely
proportional to N1 and N2, respectively. This example may implement
a power dependency factor on numerology, e.g., as described
herein.
[0105] Factors g1 and g2 may be set independently within a dynamic
range constraint of a digital-to-analog converter (DAC). This
example may allow for numerology-block-dependent setting of other
parameters and may estimate parameters, such as P.sub.0_x_i,c(q),
.alpha..sub.i,c, or PL.sub.i,c, when receiving nodes for different
numerology blocks may not be the same or when a level of
interference may be different between different blocks.
[0106] FIG. 2 illustrates an example of transmission over multiple
numerology blocks using a RF chain.
[0107] A power may be determined for a numerology block, for
example, using a formula as described herein, for each block (e.g.,
for each numerology block). Power may be allocated, for example,
when a transmission using multiple numerology blocks may use a RF
chain (e.g., single RF chain). Power allocation for a (e.g., each)
numerology block may be set differently from a required power per
block. For example, power allocation for a numerology block may be
set differently from a required power per block because of a
dynamic range constraint of a DAC. A range constraint may impose a
maximum ratio R between the powers of two numerology blocks. A
ratio of required power per block may exceed R for a pair of
blocks. In examples, power allocated to a block with the smallest
required power may be raised to P.sub.x,i'/R. P.sub.x,i' may be a
required power of a block with the largest required power. Power
allocated to a block with the largest required power may be set to
this required power.
[0108] Power allocated to a transmission using multiple numerology
blocks (e.g., in linear units) may be a function of the sum of the
powers required for each numerology block.
[0109] In examples, power allocation may be expressed according to
Eq. 3:
P x , c ( q ) = min { P CMAX , c ( q ) , 10 log 10 ( i = 1 m 10 P x
, i , c ( q ) / 10 ) } Eq . 3 ##EQU00003##
[0110] The number of numerology blocks may be denoted as m. The
same or similar procedure may apply, for example, when there may be
m simultaneous transmissions during a timer interval q, where each
transmission may use a specific numerology block.
[0111] A configured maximum transmission power, P.sub.CMAX,c(q),
may be applicable to the sum of transmissions over one or more
(e.g., all) numerology blocks of cell c. Such a parameter may be
determined by a maximum power reduction (MPR), which may be a
function of frequency allocations on each numerology block. For
example, an applicable maximum power reduction may depend on a
difference in frequency between frequency allocations of a pair of
numerology blocks.
[0112] In examples, transmission powers over one or more (e.g.,
all) numerology blocks may be scaled down by the same factor such
that P.sub.CMAX,c(q) may not be exceeded, for example, when the sum
of transmission powers over the m numerology may exceed
P.sub.CMAX,c(q). For example, transmission powers over one or more
numerology blocks may be scaled down by the same factor for a
(e.g., single) transmission using resources of multiple numerology
blocks. Transmission power may be scaled down by different factors,
for example, depending on the numerology block. For example,
transmission power may be scaled down by different factors for
multiple simultaneous transmissions. Scaling may be applied to
certain numerology blocks, for example, according to one or more
priority rules depending on a property of the numerology block
(e.g., subcarrier spacing value or symbol duration) and/or a
property of the transmission using the numerology block.
[0113] Power allocation may be used with an EIRP limitation. A WTRU
may perform simultaneous transmissions using one or more beam b
(e.g., or precoder). A (e.g., each) beam may be associated with a
beam process and/or beam pair link. A (e.g., each) beam may be
associated to a separate RF chain to allow for separate
transmissions.
[0114] A WTRU may have an (e.g., maximum) effective isotropic
radiated power (EIRP). For example, a WTRU may have a maximum EIRP
to comply with a regulatory requirement. A WTRU may impose a (e.g.,
maximum) total radiated power (TRP). The WTRU allocating power to
different transmissions while complying with the requirement may be
described herein.
[0115] Power scaling principles may be used. To comply with a
requirement of maximum EIRP, the WTRU may ensure that the EIRP over
any direction with respect to the WTRU does not exceed the maximum
EIRP (EIRP.sub.max). A direction may (e.g., typically) be defined
in terms of elevation (theta) and azimuth (phi) in a spherical
coordinate system centered at the WTRU location with a plane of
reference tied to the WTRU physical geometry. To simplify notation
in one or more examples described herein, a pair of spherical
coordinates (theta, phi) may be represented using a symbol d.
[0116] For a transmission t over a directional antenna system
(e.g., such as an array or panel), the EIRP in a specific direction
d may be expressed as the product of a conducted power P.sub.t and
of a gain function G.sub.b(t)(d), where b(t) may be an index
representing one of a set of possible beams (e.g., or radiation
patterns) that may be synthesized for transmission t. With a set of
simultaneous transmissions over a time interval q, the requirement
may be expressed as:
max d t P t ( q ) G b ( t ) ( d ) .ltoreq. EIRP max ( q )
##EQU00004##
[0117] The WTRU may comply with a requirement of maximum TRP
(TRP.sub.max), where TRP may sum up power radiated over one or more
(e.g., all) directions. The TRP.sub.max requirement may be
expressed as:
t P t ( q ) G t .ltoreq. TRP max ##EQU00005##
[0118] G.sub.t may be a parameter dependent on the antenna system
and RF chain used for the transmission. Such parameter may be
assumed to be known based on calibration and testing procedures.
The conducted power P.sub.t(q) may be calibrated such that
G.sub.t=1, for example. If the conducted power P.sub.t(q) is
calibrated to G.sub.t=1, the requirement may be similar to a
maximum total transmission power, P.sub.CMAX, where P.sub.CMAX may
be an upper bounded by TRP.sub.max.
[0119] If a set of conducted powers P.sub.t(q) is calculated based
on other power control methods and if either EIRP.sub.max or
TRP.sub.max would be exceeded in a time interval q, the WTRU may
scale transmission(s) such that the following conditions are
satisfied:
max d t w t ( i ) P t ( q ) G b ( t ) ( d ) .ltoreq. EIRP max ( q )
##EQU00006## and ##EQU00006.2## t w t ( i ) P t ( q ) .ltoreq. P
CMAX ( q ) ##EQU00006.3##
where w.sub.t(i) may be scaling factors between 0 and 1.
[0120] A WTRU may estimate the total EIRP in a particular direction
d if the WTRU has a knowledge of the gain function G.sub.b(t)(d) of
each transmission for a transmission d (e.g., every transmission
d). The gain function for a given direction may be estimated based
on knowledge of the antenna system geometry and the weights applied
to each antenna element. A WTRU may store gain functions for a
pre-determined set of directions and a pre-determined set of
possible beams. Gain functions may have been obtained from
measurements or testing.
[0121] EIRP estimation and scaling using coupling parameters may be
used. To determine whether scaling is needed due to EIRP, the WTRU
may determine: .SIGMA..sub.tP.sub.t(q)G.sub.b(t)(d) for a subset of
directions d for which EIRP is more likely to be maximum. For
example, the WTRU may estimate a value of EIRP for each
transmission t, for the direction for which G.sub.b(t)(d) is
maximized. The maximum value may be referred to as G.sub.b.sup.max,
and the corresponding direction may be referred to as Db.sup.max.
To estimate EIRP in that direction, the WTRU may add the
contributions of other beams b' for which the gain may not be
maximized at Db.sup.max. The total EIRP in the direction for which
the gain of beam b is maximized may be determined as:
EIRP b ( t ) , max tot = G b ( t ) max ( P t ( q ) + t ' .noteq. t
C b ( t ) b ' ( t ' ) P t ' ( q ) ) ##EQU00007##
where C.sub.b,b' may be the ratio between the gain of beam b' and
the gain of beam b for the direction at which the gain of beam b
may be maximum:
C b , b ' .ident. G b ' ( D b max ) G b max ##EQU00008##
This ratio may be referred to as the coupling parameter for the
pair of beams (b, b') (e.g., ordered pair of beams (b, b')). A WTRU
may determine a value of EIRP.sub.b(t),max.sup.tot for each
transmission t and may perform scaling. A WTRU may perform scaling
such that EIRP.sub.b(t),max.sup.tot may not exceed EIRP.sub.max for
any t. Coupling parameters may not be assumed to be symmetrical.
For example, C.sub.b,b' may be different from C.sub.b',b. The same
value may be used (e.g., to simplify calculations and/or reduce
signaling overhead) for C.sub.b,b' and C.sub.b',b (e.g., by using
the maximum value between C.sub.b,b' and C.sub.b',b as defined
herein).
[0122] Determination of coupling parameters may be used.
[0123] The coupling parameters may be obtained. For example, the
coupling parameters may be obtained when EIRP is estimated using
one or more of EIRP estimation approaches described herein. The
coupling parameters may be obtained using one or more of the
approaches described herein.
[0124] A WTRU-based estimation of coupling parameters with
signaling to network may be used.
[0125] Coupling parameters may be calculated and/or stored by the
WTRU based on the knowledge of the gain functions (e.g., of each
possible beam that may be generated). Calculating and/or storing
coupling parameters by the WTRU based on the knowledge of the gain
functions may be used when the number of possible beams is not very
large, or for certain implementations such as grid of beams (GoB).
The coupling parameters may be stored based on measurements.
[0126] A WTRU may provide information (e.g., to assist network
scheduling) related to coupling parameters according to one or more
of the following: (i) PHR triggered by change of P.sub.CMAX per
beam; (ii) reporting of coupling parameters; and/or (iii)
network-based estimation of coupling parameters.
[0127] A PHR triggered by change of P.sub.CMAX per beam may be
used. A WTRU may provide power headroom (PH) information pertaining
to a transmission over a beam (e.g., or beam process) that may be
based on one or more coupling parameters with beams used for
transmissions over other beams (e.g., or beam processes). The WTRU
may calculate a PH for a transmission over a first beam (e.g.,
assuming that the WTRU would be simultaneously transmitting over a
second beam using the conducted power (and/or pattern) last used
for the second beam). The PH for a beam in a time interval q may be
defined as the difference (e.g., in dB units) between a configured
maximum transmission power applicable to the beam P.sub.CMAX,b(q)
and the required transmission power using the beam in the time
interval. The value of P.sub.CMAX,b(q) may be dependent on the gain
functions of the beams used, as described herein. A PHR may be
triggered at least when the value of P.sub.CMAX,b(q) changes since
the last report transmission. For example, a PHR may be triggered
at least when the absolute difference value of P.sub.CMAX,b(q)
changes higher than a threshold since the last report
transmission.
[0128] Reporting of coupling parameters may be used. A WTRU may
(e.g., directly) provide the value of at least one coupling
parameter applicable to a pair of beams.
[0129] For example, the WTRU may transmit one or more coupling
parameters pertaining to beams currently used or configured (e.g.,
for each beam process or beam pair link). The one or more coupling
parameter information may be provided in media access control (MAC)
layer signaling. The one or more coupling parameter information may
be provided in MAC layer along with or as part of a power headroom
(PH) report. The report may be triggered based on changes in the
value of one or more of the coupling parameters. For example, a
report may be triggered if the value of one or more coupling
parameters changes by more than a threshold, or becomes higher (or
lower) than a threshold. The threshold may be pre-defined or
configured by a higher layer. The information (e.g., coupling
parameters pertaining to beams currently used or configured) may be
provided as physical layer signaling (e.g., uplink control
information). For example, coupling information may be quantized to
a few bits, or a single bit. Coupling information may be
transmitted periodically or upon following reception of downlink
control information. The transmitted coupling information may
indicate an uplink grant or may indicate a trigger for the
transmission of coupling information.
[0130] A WTRU may provide a set of coupling parameters between
(e.g., all or a subset of) possible pairs of beams that may be
generated by an (e.g., each) antenna system. The set of coupling
parameter information may be provided by higher layer signaling,
for example as part of capability information along with other
antenna related information. The network may be informed of and/or
may control the identities of the beams in use for each beam
process or beam pair link. For example, upon a change of beam for
one or more beam processes, the WTRU may provide the identity of
the new beam and/or the identity of the beam that most closely
matches the pattern of the new beam.
[0131] Network-based estimation of coupling parameters may be used.
The coupling parameters may be obtained from signaling from the
network, such as a physical layer, MAC, and/or radio resource
control (RRC) layer signaling. For example, the coupling parameters
applicable to transmission t may be provided as part of the
corresponding grant. The coupling parameters may be measured at the
transmit/receive point (TRP) network. For example, the coupling
parameters may be measured at the TRP network based on the
assumption that most of the energy received at the TRP for beam b
may be contributed by the main lobe of beam b. Using the same beam
at the TRP, the ratio between received power from a signal
transmitted using beam b and received power from a signal
transmitted using beam b' may provide an estimate of C.sub.b,b'.
The WTRU may transmit a sounding signal using each beam. For
example, the WTRU may transmit a sounding signal using each beam
upon reception of a trigger from physical layer or higher layer
signaling.
[0132] Dual connectivity power allocation with an EIRP requirement
may be used. A WTRU may be configured with two MAC instances (or
cell groups), e.g., in a NR-LTE, LTE-LTE, or NR-NR dual
connectivity scenario. The WTRU may calculate the power allocation
of transmissions of one or more cell groups based on EIRP
requirements according to one of the following. A WTRU may
determine a power available to a first cell group (e.g., in terms
of conducted power) by determining a tentative power allocation of
the first cell group using power allocation with two cell groups,
for example using power control mode 1 or mode 2. A guaranteed
power available to each cell group may be considered. The WTRU may
determine if the EIRP requirement would be satisfied when
transmissions from the second cell group are taken into account. If
the EIRP requirement would not be satisfied with the tentative
power allocation, the WTRU may determine an actual power allocation
for the cell group that may be lower than the tentative power
allocation such that the EIRP requirement may be met.
[0133] A WTRU may be configured to use power allocation where a
power allocation of a first cell group may be determined based on
one or more of the following: the configured maximum total power
P.sub.CMAX, the total power of on-going transmissions of a second
cell group, and/or the guaranteed power of a second cell group. A
WTRU may determine a tentative power allocation for a first cell
group P.sub.CG1,t using a procedure for the determination of the
power allocation of a cell group with power control mode 2. The
WTRU may determine if EIRP.sub.max would be exceeded (e.g., using
one of the procedures described herein) for the portion that
overlaps with the on-going transmissions of CG2 and for the portion
that overlaps with the subsequent transmissions of CG2 as described
herein.
[0134] For the portion that overlaps with the on-going
transmissions of CG2, the WTRU may scale transmissions of CG1 using
factors w.sub.t'(i) such that the following condition may be
satisfied for any direction d:
t .di-elect cons. CG 2 P t ( q ) G b ( t ) ( d ) + t .di-elect
cons. CG 1 w t ' ( i ) P t ( q ) G b ( t ) ( d ) .ltoreq. EIRP max
( q ) ##EQU00009##
[0135] For the portion that overlaps with the subsequent
transmissions of CG2, the WTRU may not be aware of the power
requirements of such transmissions at the time of making the
determination. A WTRU may determine or assume that CG2 would use up
to its guaranteed power PCG2 and that such guaranteed power may be
used by a transmission (e.g., single transmission) over a beam
(e.g., single beam). The WTRU may scale transmissions of CG1 using
wt''(i) such that the following condition is satisfied for any
direction d for any beam b(t') that may be configured to be used
for a transmission of CG2.
min [ P CG 2 G b ( t ' ) ( d ) , EIRP max ( q ) ] + t .di-elect
cons. CG 1 w t '' ( i ) P t ( q ) G b ( t ) ( d ) .ltoreq. EIRP max
( q ) ##EQU00010##
[0136] The WTRU may determine or assume that CG2 would use up to
its guaranteed power but that such guaranteed power would be shared
in a specific way among transmissions of CG2 (e.g., based on the
latest transmission from CG2 or on an equal basis). The WTRU may
perform scaling according to the same principles as described
herein (e.g., based on coupling parameters).
[0137] For each transmission t of CG1, the WTRU may determine its
scaling factor as the minimum between wt'(i) and wt''(i).
[0138] Power allocation for transmission may use multiple beams
with P.sub.CMAX configured per direction. For example, a WTRU may
be configured to perform a first transmission using a first
transmission beam and a second transmission using a second
transmission beam.
[0139] A WTRU may use (e.g., to comply with EIRP) coupling
parameters that take the value 0 or 1 depending on the angular
separation between the main lobes of the beams illustrated FIGS. 3
and 4 respectively, where alpha and beta may represent separation
between beam 1 and beam 2 in angular domain, and theta may be an
angular threshold. As shown in FIG. 3, alpha may be larger than the
threshold (e.g., theta). As shown in FIG. 4, beta may be smaller
than the angular threshold (e.g., theta). The angular separation
between the beams may be based on one or more of an angular
distance, directional correlation, and/or spatial separation of the
first and second transmission beam.
[0140] A WTRU may determine/configure an uplink transmission power
(e.g., maximum transmission power) for one or more of the first or
second transmissions. For example, a configured maximum
transmission power P.sub.CMAX,d(q) may be defined and be applicable
on a per beam (or direction) basis. For example, the total power of
multiple beams may exceed a threshold if the beams are separated by
more than a first separation threshold (e.g., theta) in spatial (or
angular) domain. If the angular separation of the first and second
transmission beams is greater than the first separation threshold,
the uplink transmission power may be determined. For example, the
uplink transmission power may be determined based on the first
transmission and the second transmission. The first transmission
may be associated with the first transmission beam having a first
maximum power level parameter. The second transmission may be
associated with the second transmission beam having a second
maximum power level parameter. If a system uses an analog beam
capable antenna system (e.g., having fixed angular separation),
angular separation of the beams may be configured based on the
location/position of the antenna in the system. The configured
maximum transmission power per direction may be defined in terms of
conducted power (e.g., first and second maximum power level
parameter). For example, the configured maximum transmission power
per direction may be determined based on EIRP.sub.max(q) and/or the
maximum gain Gb.sup.max over one or more (e.g., all) possible beams
that may be synthesized by the WTRU, e.g.,
P.sub.CMAX,d(q)=EIRP.sub.max(q)/Gb.sup.max. P.sub.CMAX,d(q) may be
defined in terms of EIRP. The threshold used with P.sub.CMAX,d may
be half-power bandwidth. The half-power bandwidth may be signaled
as part of the WTRU beamforming capability.
[0141] A WTRU may determine a total transmission power P.sub.x,b(q)
for one or more (e.g., all) transmissions, for example, using a
beam b, which may be based on one or more example procedures
discussed herein. For example, if an angular separation of the
first and second transmission beams is less than a second
separation threshold, the uplink transmission power may be
determined. For example, the uplink transmission power may be
determined based on the first transmission and the second
transmission having a shared maximum power level parameter. For
example, the first transmission may be associated with the first
transmission beam, and the second transmission may be associated
with the second transmission beam. A WTRU may determine (e.g., for
each subset of beams that may be within a spatial separation
threshold) a sum of transmission powers (e.g., in linear units)
over a subset of beams (e.g., if the angular separation of the
transmission beams is less than a separation threshold). A sum of
transmission powers may exceed a configured maximum transmission
power P.sub.CMAX,d(q). A WTRU may scale down a power of at least
one transmission (e.g., using at least one of the subset of beams)
so that P.sub.CMAX,d(q) may not be exceeded. The conducted
transmission powers of each transmission may be multiplied by the
maximum gain of the corresponding beam before the summation (e.g.,
where P.sub.CMAX,d(q) may be defined in terms of EIRP). Scaling may
be applied to certain transmissions (e.g., in a certain order), for
example, according to one or more priority rules.
[0142] The first transmission and the second transmission may be
transmitted using the first transmission beam and second
transmission, respectively. The transmitted first and/or second
beam may be scaled.
[0143] Reduction of P.sub.CMAX applicable to a beam caused by EIRP
may be used. A configured maximum transmission power
P.sub.CMAX,b(q) may be defined for transmission over a beam or beam
process in a time interval q. A power reduction (e.g., maximum
power reduction) due to EIRP may be applied in the time interval if
the WTRU is simultaneously transmitting in the time interval q
using at least one second beam b'. The amount of reduction may be
determined as a function of the gain e.g., G.sub.b(d) and/or
G.sub.b'(d). For an example, the amount of reduction may be based
on coupling parameters C.sub.b,b' and C.sub.b',b. In examples, the
amount of reduction may be determined based on the angular
separation between the main lobes of b and b'.
[0144] A transmission may be capped by P.sub.CMAX,b(q). Subsequent
scaling may be applied to comply with total radiated power and/or
EIRP requirements as described herein.
[0145] Resource selection may be power-aware. A WTRU may select a
resource for a first transmission, for example, from a set of
configured resources provided by physical layer signaling and/or
higher layer signaling. A resource may be defined in time,
frequency, and/or space (or beam) domain. A first transmission may
occur with a second transmission for which resource selection may
not apply. For example, the first transmission may occur
simultaneously with the second transmission for which resource
selection may not apply to a fully scheduled transmission.
[0146] In examples, selection of a resource for a first
transmission may be based on a resource used for a second
transmission. For example, the first transmission may be based on a
resource used for the second transmission to attempt to maximize a
configured maximum transmission power that may be applicable to the
total transmission power of both transmissions. A resource may be
selected so that the allocated power for a first transmission may
be maximized (e.g., up to its required or desired power), for
example, based on the configured maximum transmission power
applicable to the total transmission and other configured maximum
transmission power parameters that may be applicable to each
transmission, e.g., individually.
[0147] A second transmission may occupy resources in the frequency
domain in accordance with a given allocation. For example, a
frequency domain allocation of a first transmission may be selected
so as to attempt to maximize the applicable configured maximum
transmission power P.sub.CMAX,c(q) A frequency domain allocation of
the first transmission may be selected minimize a maximum power
reduction. A frequency domain allocation of the first transmission
may be selected to adjust maximum power reduction. Maximization may
be achieved. For example, maximization may be achieved by
maximizing a gap between the frequency allocations of multiple
(e.g., both) transmissions.
[0148] In examples, a second transmission may utilize a certain
beam. A beam used for the first transmission may be selected to
attempt to maximize its transmission power. For example, the beam
used for the first transmission may be selected to attempt to
maximize the transmission power up to its required or desired
power. The beam may be selected to attempt to maximize the
transmission power based on a configured maximum transmission power
per direction P.sub.CMAX,d(q) and/or other configured maximum
transmission power per beam. Selecting a beam used for the first
transmission to maximize the transmission power, as described
herein, may result in a WTRU selecting a beam for a first
transmission whose spatial (or angular) separation with the beam
used for a second transmission may be above a threshold, for
example, when scaling may be used to satisfy a configured maximum
transmission power per direction.
[0149] Power prioritization and priority rules applicable to
transmissions may use one or more numerologies, beams, and/or
waveforms. Scaling may be applied over a set of numerology blocks
or transmissions. One or more of the following properties (or
criteria) may be used to determine priority order and/or properties
used in other systems (such as a type of information carried by a
transmission): (i) a numerology parameter applicable to a
numerology block or transmission (e.g., scaling may be applied to
transmissions using a lower subcarrier spacing, or a larger symbol
duration); (ii) duration of a transmission; (iii) a beam index or
beam process index (e.g., scaling may be applied last to
transmissions associated with a primary beam); (iv) an explicit
indication received from downlink control information applicable to
a transmission or numerology block; (v) a property associated with
a beam (or usage of beam); (vi) waveform used for transmission
(e.g., CP-OFDM or SC-FDMA); and/or (vii) type of UL transmission
(e.g., scaling may be applied to a transmission performed without
an UL grant and/or to a transmission using multiple repetition for
higher reliability). For example, scaling may be applied (e.g.,
last) to transmissions associated with a beam process associated to
control transmissions in downlink and/or uplink or scaling may be
applied (e.g., last) to transmissions associated with a default
beam or fallback beam.
[0150] Overall priority between transmissions or numerology blocks
may be determined from one or more criterion. In examples, a second
or other criterion described herein may be considered, for example,
when a value of a first criterion may be the same among
transmissions to be prioritized. For example, transmissions may be
(e.g., first) prioritized by the information that the transmissions
carry (e.g., a type of higher layer data and/or control
information) and (e.g., second) by subcarrier spacing. Subcarrier
spacing criterion may be considered among transmissions of the same
type of higher layer data and/or control information.
[0151] A transmission using a first waveform may apply a first set
of prioritization based on a first combination of one or more
(e.g., all) of the properties described herein, and transmissions
using a second waveform may apply a second set of prioritization
based on a second combination of one or more (e.g., all) of the
properties described herein. The priorities may be defined per
waveform and, within each waveform, (e.g., where multiple
simultaneous transmissions may occur using multiple different
waveforms) the appropriate set of some or all of the above
priorities may be used. In other example, the priorities for
multiple simultaneous waveform transmissions may be of a third set
of prioritization based on a third combination of one or more of
the properties described herein. The first, second, and third
combination may include one or more of different properties
described herein.
[0152] UL transmissions may be scheduled in a non-contiguous
manner. For example, one or more UL transmissions may be scheduled
over sets of non-adjacent PRBs in a non-contiguous manner. A WTRU
may be configured with a set of priorities based on one or more
(e.g., all) of the properties described herein and/or on whether
contiguous or non-contiguous allocation is used.
[0153] A non-contiguous allocation may include one or more (e.g.,
multiple) blocks of contiguous PRBs. A block (e.g., each block) may
be defined to have its own priority. In examples, the priority
order of the blocks may be pre-configured. In examples, the
priority order of the blocks may be indicated to the WTRU. The
priority of the blocks may depend on the blocks' location within
the carrier. For example, blocks located near the edge of a
bandwidth may have different priorities than blocks located near
the middle. The priority of the blocks may depend on a frequency
domain location within a carrier. For example, a carrier may be
divided into one or more regions (e.g., in frequency domain) with
different waveform use. Blocks transmitted near the edge of such a
region may use lower power to enable appropriate filtering. The
block transmitted near the edge may have high priority (e.g., they
may be using reduced power). In examples, blocks near the edge may
be given low priority (e.g., they may cause an interference).
[0154] Power applicable to transmissions associated with a
numerology block or beam may be guaranteed. A guaranteed power may
be expressed as a ratio of a configured maximum transmission power.
A guaranteed power expressed as a ratio of a configured maximum
transmission power may be configured for one or more types of
transmissions and/or numerology blocks. A guaranteed power may be
configured for a subset of transmissions. Scaling down of power for
a subset of transmissions may be constrained to not result in
decreasing the total power of the subset below a guaranteed power.
For example, if a guaranteed power is configured for a certain
subset of transmissions, scaling down of power for a subset of
transmissions may be constrained to not result in decreasing the
total power of the subset below a guaranteed power. A guaranteed
power may be applied to subset of transmissions based on, for
example, one or more of the following properties: (i) scheduled
transmissions or unscheduled transmissions; (ii) transmissions
indicated (e.g., explicitly indicated) to be subject to guaranteed
power by downlink control information; (iii) transmissions
associated with a numerology block (e.g., or using a certain
subcarrier spacing); (iv) transmissions associated with a certain
beam or beam process (e.g., a beam index, a primary beam, a beam
used for control information, a fallback beam, and/or a default
beam); (v) transmissions associated to a waveform type; and/or (vi)
contiguous or non-contiguous allocation.
[0155] A WTRU with multiple simultaneous transmissions using
multiple waveforms may be configured with guaranteed minimum power
for each set of transmissions for each waveform type. If minimum
power for each set of transmissions for each waveform type is
ensured, the WTRU may allocate any remaining power in a manner
using priority rules as described herein.
[0156] Different blocks of PRBs in a non-contiguous allocation may
have different guaranteed minimum power. The different guaranteed
minimum power of each block may depend on the content of the
transmission of a block or the location within the over-all carrier
spectrum of a block.
[0157] A WTRU may determine the transmission power for a
transmission (e.g., or for a portion of a transmission) in a first
numerology block as a function of guaranteed powers for a first and
second numerology blocks. The first and second numerology blocks
may correspond to different TTI durations. The first and second
numerology blocks may belong to the same MAC instance.
[0158] The guaranteed powers may be determined semi-statically
and/or dynamically, for example, based on a field of downlink
control information (DCI) signaling the grant applicable to the
first transmission. The values may be determined based on whether
the transmission overlaps in time with time occasions (e.g., or
resources defined in the time domain) configured by higher layers.
Time resources may correspond to resources available to certain
types of transmission (e.g., higher priority transmissions).
[0159] When determining the available transmission power for
transmissions of the first numerology block, the WTRU may change
the power such that transmissions of the second numerology that may
overlap in time with the first transmission (e.g., starting at the
same time or later than the first transmission) may be allocated up
to the guaranteed power for the second numerology block, according
to principles similar to power control mode 2 for dual
connectivity. If at least one transmission of the second numerology
block starts at the same time as the first transmission and the
WTRU can determine that no other transmission from the second
numerology block starting later can overlap, the WTRU may determine
the power of the first transmission based on the power requirements
of the transmission of the second numerology block. The WTRU may
take into account the guaranteed power applicable to the first
transmission and/or other priority criteria, for example, according
to principles similar to power control mode 1 for dual connectivity
when, for example, at least one transmission of the second
numerology block starts at the same time as the first transmission
and the WTRU can determine that no other transmission from the
second numerology block starting later can overlap.
[0160] The power allocation of a transmission may be allowed to
change at certain times. Each interval of time over which power is
not allowed to change may be referred to as a portion. In case a
transmission of a first numerology block has more than a portion,
the determination of power for each portion may be based on
transmissions of the second numerology blocks that may overlap in
time within the portion. The WTRU may determine guaranteed power
values that are dependent on the specific portion of the
transmission. The guaranteed power values may be provided by
dynamic signaling. The values may be determined based on whether
the portion overlaps with time occasions (e.g., or resources
defined in the time domain) defined by higher layers.
[0161] The guaranteed power for a numerology block may be expressed
in terms of a fraction of the configured total maximum power for
the WTRU (e.g., P.sub.CMAX) or of the available power to the MAC in
absolute units (e.g., in mW or dBm), at least when the WTRU is
configured with a MAC instance.
[0162] A WTRU may be configured with two MAC instances. One or more
numerology blocks may be associated with each MAC instance. The
WTRU may determine the power available to a first MAC instance,
based on the transmission powers of on-going transmissions and/or
the guaranteed power for a second MAC instance. The WTRU may
determine a guaranteed power for each numerology block associated
to the first MAC instance as a fraction of the power available to
the first MAC instance. The fraction may be signaled using physical
layer and/or higher layer signaling as described herein.
[0163] Power may be allocated in the presence of unintended
receivers (e.g., victim nodes). In examples, receiving nodes may be
densely packed in a close geographic proximity. A receiving node
may be, for example, a WTRU, a TRP, a relay, and the like. Data
transmitted may originate from one or more of WTRUs, TRPs, and/or
relays. Flexibility may permit multiple directions of transmissions
(e.g., UL, DL, and/or single-link (SL)) to be scheduled
simultaneously on overlapping sets of resources.
[0164] Interference may be reduced on neighboring receiving nodes.
A WTRU may be based on its contribution to that interference and
may modify its UL transmission power. This may be applicable, for
example, when beamforming may be used, and when a WTRU transmits in
a beam direction to its intended receiving node with another
receiving node (e.g., a victim node) located along the same beam
path.
[0165] A WTRU may be configured with a set of parameters that the
WTRU may use to modify its UL power control formulas. Parameters
that may be used to modify UL power control formulas may include,
for example, one or more of the following: (i) total number of
victim nodes; (ii) identity of victim node(s); (iii) path loss to
victim node(s); (iv) maximum receive interference power at victim
node(s); (v) alpha factor; (vi) numerology used at victim node(s);
(vii) resources on which to modify UL power; and/or (viii) type of
victim node(s).
[0166] In examples of a total number of victim nodes, a WTRU's
transmission may create interference to a set of nodes, which may
be deemed victim nodes. A WTRU may be configured with a number of
victim nodes, for example, given that the power formula the WTRU
uses may be a function of the total number of victim nodes (e.g.,
many victims, a single victim, and/or no victim).
[0167] In examples of identity of victim node(s), an identity of a
node may (e.g., first) enable a WTRU to find resources on which it
may make measurements, for example, to determine the value of an
item on this list.
[0168] In examples of path loss to victim node(s), a WTRU may
calculate a path loss to victim node(s). Calculating a pathloss to
victim node(s) may involve knowledge of the transmission power of
victim node(s), which may be indicated by a serving node, may be
broadcast by potential victim nodes, or may be signaled in a
dedicated manner from potential victim node(s).
[0169] In examples of a maximum receive interference power at
victim node(s), a parameter may indicate to a WTRU a maximum
interference power that a victim node may be able to operate
with.
[0170] An alpha factor may indicate, for example, a potential per
victim node.
[0171] In examples of resources on which to modify UL power, a WTRU
may use a first power control formula assuming a number of victim
nodes (e.g., many, one, and/or none) for transmission in a first
set of resources and may use a second power control formula
assuming a different number of victim node (e.g., many, one, and/or
none) for transmissions in a second set of resources. Resources may
be, for example, one or more of the following: time resources
(e.g., subframes, slots, or symbol), frequency resources (e.g.,
PRBs or subcarriers), spatial resources (e.g., analog or digital
beams), non-orthogonal multiple access resources (e.g., spreading
sequence or interleaver), and/or the like.
[0172] In examples of type of victim node(s), victim nodes may be
segregated into types (e.g., WTRUs, TRPs, and/or relays). Other
parameters may be affected, for example, depending on the type of
victim nodes. For example, the alpha factor of a victim node may
take on a different value depending on the victim node type.
[0173] One or more of parameters described herein and/or other
parameters may be included in a power control formula, such as an
example formula presented herein. For example, a WTRU may be
transmitting using a numerology (e.g., a single numerology). A WTRU
may be configured with a set K victim nodes. A WTRU may determine a
PUSCH transmitted power using, for example, Eq. 4:
P x , i , c ( q ) = min { P CMAX , c ( q ) , min k .di-elect cons.
K ( P O _ INT , k , c ( q ) + .alpha. k PL k + .theta. k ) , 10 log
10 ( M x , i , c ( q ) ) + 10 log 10 ( N i , c ) + P O _ x , i , c
( q ) + .alpha. c PL c + .DELTA. TF , c ( q ) + f c ( q ) } Eq . 4
##EQU00011##
[0174] P.sub.O_INT,k,c may be a maximum interference power
allowable at victim node k, and .theta..sub.k may be an offset
factor (e.g., similar to one or more combination of M.sub.x,i,c(q),
N.sub.i,c, .DELTA..sub.TF,c(q), and/or f.sub.c(q)).
[0175] Other equations, such as examples presented herein, may be
modified, for example, by including one or more parameters
associated with victim nodes in a power control formula, such as
described herein. For example, a WTRU may determine a transmitted
power using Eq. 5:
P x , i , c ( q ) = min { P CMAX , c ( q ) , 10 log 10 ( M x , i ,
c ( q ) ) + 10 log 10 ( N i , c ) + P O _ x , i , c ( j ) + .alpha.
c * ( j ) PL c + .DELTA. TF , c ( q ) + f c ( q ) } Eq . 5
##EQU00012##
[0176] In examples, a WTRU may use a different set of parameters
(e.g., other than those indicated in formulas presented herein),
and the different set of parameters may depend on the presence of
one or more victim nodes. For example, the value used for
.alpha..sub.c*(j) in Eq. 5 may depend on the presence of one or
more victim nodes. In examples, a power control formula may produce
multiple different values depending on the presence victim node(s)
(e.g., none, one or more victim nodes).
[0177] A WTRU may receive a dynamic indication of one or more
(e.g., enhanced) power control formulas, which may, for example,
account for the presence of victim nodes. For example, a WTRU may
be semi-statically configured with a power control parameter
adjustment to use in the presence of a victim node. A dynamic
indication may be used to switch or toggle a WTRU between using
power control formulas that may assume, for example, multiple, one,
or no victim nodes.
[0178] One or more parameters to use in a (e.g., an enhanced) power
control formula may be determined, for example, by a WTRU. For
example, a WTRU may be configured with a set of resources on which
the WTRU may make measurements from a number of possible victim
nodes. In examples, a WTRU may determine (e.g., determine
autonomously) resources on which the WTRU may make measurements
from a number of possible victim nodes.
[0179] A WTRU may indicate a set of victim nodes to its serving
node. A set may be composed of nodes whose measurements may achieve
a certain criterion. For example, a WTRU may measure path loss on
resources and may select the top n nodes achieving the lowest path
loss value. In examples, a WTRU may measure path loss on resources
and may select one or more nodes whose path loss may be within a
delta value of the path loss to its serving node. In examples, a
WTRU may measure activity (e.g., as a function of ratio of presence
of a signal transmitted in a resource) and may report a set of n
nodes for which the activity may be considered above a
threshold.
[0180] Dual connectivity may permit multiple (e.g., two) scheduling
entities and may not synchronize carrier (e.g., there may be a
reference subframe rule for overlapping transmissions). A time
domain numerology may differ between base stations, for example,
when using DC with NR. A rule in DC may be to define a time domain
related reference entity on which power allocation rules may rely
on. The longest time domain scheduling entity may be a reference
for power control procedures.
[0181] In examples, a WTRU may start a power allocation process for
overlapping transmission between carriers with a carrier that may
hold a reference time entity using, for example, basic allocation
rules defined for a carrier followed by lower time based scheduled
entities. If a power limitation occurs, a WTRU may consider a
priority that may be determined to have been network signaled. For
example, the WTRU may consider a priority that may be determined to
have been network signaled based on SCS size or the shortest time
domain configured scheduling resource.
[0182] If a power limited situation occurs, other (e.g., similar)
rules described in various (e.g., CA) scenarios may be followed,
for example, along with WTRU signaling to a network at a master
base station or a configuring master network entity about a power
limitation situation (e.g., with similar consequences from the
network side).
[0183] Power sharing with band-dependent power may be used. For
example, power sharing with band-dependent maximum power may be
used. There may be a limitation regarding the maximum total
transmission power that is dependent on one or more characteristics
of the set of transmissions. For example, the allowed maximum total
transmission power may be dependent on one or more of a frequency
band, a radio access technology (RAT), and/or a waveform type. For
example, a maximum total transmission power may be dependent on the
frequency band due to differing maximum surface absorption rate
(SAR) requirements depending on the band.
[0184] When a WTRU performs (e.g., simultaneously performs)
transmissions that do not share one or more (e.g., all) the same
characteristics, for example transmissions in different frequency
bands, one or more of the transmissions may be subject to a
limitation. For example, one or more of the transmissions may be
subject to a limitation on the maximum total normalized
transmission power. The normalized transmission power may be
defined as the ratio (e.g., in linear units) between the
transmission power and the maximum total transmission power
applicable to a set of transmissions having the same
characteristics (e.g., on the same frequency band). The maximum
total normalized transmission power may be equal to one (1). For
example, the maximum total normalized transmission power being
equal to one may be represented by the following formula:
b i = 1 N b P i , b P CMAX , b .ltoreq. 1 ##EQU00013##
[0185] In this formula, the parameter b may represent an index over
sets of transmissions, where each set may share the same
characteristics (e.g., frequency band). The parameter i may
represent an index over transmissions within each set. Parameter
N.sub.b may represent the number of transmissions in the b.sup.th
set. Parameter P.sub.i,b may represent the transmission power of
the ith transmission of the b.sup.th set. P.sub.CMAX,b may
represent a configured maximum total transmission power applicable
to transmissions of the b.sup.th set. P.sub.CMAX,b as configured
maximum total transmission power for a b set may include a power
reduction related to the specific band, for example due to SAR or
MPE (Maximum Power Exposure) safety limit, respectively.
[0186] Using a limitation for the maximum total power may ensure
that the WTRU satisfies requirements related to surface absorption
rate caused by exposure to transmissions in multiple frequency
bands.
[0187] If a limitation is defined in terms of total normalized
transmission power, the determination of power sharing between
transmissions (e.g., or of power scaling) may be based on one or
more of the following criterion/procedures.
[0188] An example technique for determining how power is to be
shared (e.g., or how power is to be scaled) between transmissions
may utilize a configured guaranteed power for one or more of the
transmissions (e.g., for each transmissions). For example, a
guaranteed power may be configured for the transmissions of a cell
group, numerology block, and/or beam. Guaranteed power may be
defined as a ratio (e.g., percentage) of a configured total
transmission power. The configured total transmission power may be
a function of the cell group, numerology block, and/or beam for
which the guaranteed power may be applicable. If the configured
total transmission power is a function of the cell group,
numerology block, and/or beam for which the guaranteed power is
applicable, the guaranteed power may be referred to as a guaranteed
normalized power.
[0189] Power allocation or power scaling may be performed using
normalized power. For example, power allocation or power scaling
may be performed using normalized power rather than and/or in
addition to using absolute power. For example, normalized power may
divide the transmission power by configured total transmission
power applicable to the set of transmissions.
[0190] Power allocation may be performed with two or more cell
groups. For example, power allocation may be performed with two
cell groups: a first corresponding to a set of carriers within the
3.5 GHz band and a second corresponding to a set of carriers at
around 30 GHz. The configured maximum total power applicable to the
first cell group (at 3.5 GHz) may be 23 dBm (or 200 mW), while the
configured maximum total power applicable to the second cell group
(at 30 GHz) may be 20 dBm (or 100 mW). The guaranteed (e.g.,
normalized) power may be 30% and 40% for the first and second cell
groups, respectively. The WTRU may determine (e.g., a required or
desired) transmission power for each transmission of each cell
group using, for example, open-loop power control, closed-loop
power control, and/or a combination of open-loop and closed loop
power control. The WTRU may determine a normalized required
transmission power for each transmission by dividing (e.g., in
linear units) the required transmission power by the configured
maximum total power applicable to the cell group of the
transmission. For example, for a transmission requiring 13 dBm (or
20 mW) in the first cell group, the normalized required
transmission power may be (20 mW/200 mW)=0.10, while for a
transmission requiring 13 dBm (or 20 mW) in the second cell group,
the normalized required transmission power would be (20 mW/100
mW)=0.20. Power allocation calculations may be similar to the
calculations used for power control mode 1 (or mode 2) for LTE dual
connectivity, except that scaling may be applied to the normalized
required transmission power values instead of the absolute required
transmission power values. The guaranteed normalized powers and the
remaining power (e.g., 100% minus the sum of guaranteed powers) may
be expressed as a ratio. When calculations are completed, the sum
of the scaled normalized transmission power values may not exceed
the value one (1). The WTRU may determine the actual scaled
transmission power value for a specific transmission by multiplying
the scaled normalized transmission power by the configured total
transmission power applicable to the cell group of this
transmission. For example, if the scaled normalized transmission
power is 0.10 for a transmission of the second cell group, the
actual scaled transmission power may be (0.10.times.100 mW)=10 mW
or 10 dBm.
[0191] A WTRU and a network entity (e.g., gNB) may exchange power
control related signaling. A power headroom report (PHR) may be
triggered and/or calculated with multiple numerologies.
[0192] Uplink transmissions in the time domain for multiplexed
numerologies and/or waveforms may or may not overlap, for example,
depending on configuration and/or multiplexing transmission state
of the uplink transmissions.
[0193] One or more types of PHR may be defined, for example, when
multiple numerologies and/or waveforms are multiplexed. For
example, a type of PHR may be defined for a specific numerology
and/or waveforms and may be computed as a difference between
P.sub.CMAX,c(q) and P.sub.x,i,c(q) allocated power during
transmission time q.
[0194] A virtual PHR may be computed (e.g., when a WTRU supports
unscheduled transmissions that are not ongoing), for example, by
subtracting from P.sub.CMAX,c(q) (e.g., computed with coexistence
related back offs set to zero) a virtual power allocation
P.sub.x,i,c(q) by an unscheduled but reserved grant.
[0195] A power headroom report (PHR) for a numerology and/or
waveforms may take into consideration a power reservation ratio
(e.g., when signaled or determined), for example, by calculating
its power headroom against its reserved power ratio.
[0196] An example type of PHR may be a composite. A composite PHR
may be based on one or more (e.g., all) ongoing transmissions. A
composite PHR may include, for example, one or more of the
following: (i) an individual numerology and/or waveforms related
PHR for real transmissions; (ii) a combination of a real
transmission PHR combined with a virtual transmission for
unscheduled ones on another numerology and/or waveforms; and/or
(iii) a virtual PHR for different numerologies and/or waveforms
(e.g., when no real transmissions occurred in a past specific
defined time interval duration).
[0197] A PHR may take into consideration whether contiguous or
non-contiguous allocations are expected. If a PHR expects a
non-contiguous allocation, a WTRU may be configured to use
different MPR values per non-contiguous block (e.g., depending on
the location within the over-all carrier spectrum of each block).
The PHR type may segment the spectrum into one or more different
regions (e.g., each with an assumed MPR value) and may lead to
reporting a different PHR per region. The PHR may include values
for different combinations of non-contiguous blocks. For example,
for transmissions assuming blocks at one edge of the spectrum and
at the center, the WTRU may report a first PHR value. For
transmissions at both edges of the spectrum, the WTRU may report a
second PHR value.
[0198] A PHR may be transmitted by the WTRU to the based station
for assisting with scheduling. A PHR may be periodically scheduled
or triggered, for example, by a change in one or more parameters,
such as one or more of the following: (i) a path loss change beyond
a threshold to the best serving TRP; (ii) a change in TRP serving
set (e.g., a collection of TRPs that a WTRU may be actively
communicating with); (iii) output power management reductions
(P-MPR) or (e.g., sudden) changes of uplink power transmissions
(e.g., NR may support unscheduled transmissions); (iv) dual
connectivity (e.g., when an unscheduled transmission starts one
carrier and the other scheduling entity may be configured to be
aware of power reductions); and/or (v) a change of waveforms (e.g.,
a WTRU may be indicated or determined autonomously when to change
waveforms and/or an event may trigger a PHR for one or more of the
new waveform type and/or for one or more (e.g., all) possible
waveform types).
[0199] A limited power situation may be signaled, for example, when
power reservation is used. A power reservation for a specific
carrier or numerology may cause limited power. A WTRU may determine
that there may be a priority hierarchy between numerologies (e.g.,
carriers). A WTRU may signal the power limitation to the network.
For example, a WTRU may set a bit flag that may be specific to a
numerology or carrier. A WTRU may send a PHR with a zero or
negative power headroom indication or a MAC indication. A WTRU may
trigger a RRC event. A network may signal a new power reservation
ratio. For example, a network may signal a new power reservation
ration upon reception of an indication from a WTRU. A network may
perform a resource allocation reconfiguration. A network may adapt
uplink scheduling grants to available resources. A may trigger a
handover preparation.
[0200] Systems, methods, and instrumentalities have been disclosed
for uplink power control, e.g., for New Radio (NR). A WTRU may
perform power control for uplink transmissions with multiplexed
numerologies, beamforming, and/or related signaling. For example,
WTRU may determine a transmission power based on one or more of
power allocation rules, priorities, dependency on numerology,
multiplexed numerologies, interference (e.g., victim nodes),
beamforming, and/or uplink power control related signaling. Power
allocation may be dependent on numerology. Power allocation with
multiple numerologies may consider a maximum DAC dynamic range
and/or a maximum configured power. Power applicable to
transmissions may be guaranteed. Power allocation for transmission
may use multiple beams with P.sub.CMAX configured per direction.
Resource selection may be power-aware. Priority rules may be
applicable to transmissions using multiple numerologies and/or
beams. Power may be allocated based on the presence of unintended
receivers (e.g., victim nodes). Power headroom reports may be
triggered and/or calculated with multiple numerologies. Power
limitations may be signaled with multiplexed numerologies.
[0201] The processes and instrumentalities described herein may
apply in any combination, may apply to other wireless technologies,
and for other services.
[0202] A WTRU may refer to an identity of the physical device, or
to the user's identity such as subscription related identities,
e.g., mobile station international subscriber directory number
(MSISDN), session initiation protocol (SIP) uniform resource
identifier (URI), etc. WTRU may refer to application-based
identities, e.g., user names that may be used per application.
[0203] The processes described above may be implemented in a
computer program, software, and/or firmware incorporated in a
computer-readable medium for execution by a computer and/or
processor. Examples of computer-readable media include, but are not
limited to, electronic signals (transmitted over wired and/or
wireless connections) and/or computer-readable storage media.
Examples of computer-readable storage media include, but are not
limited to, a read only memory (ROM), a random access memory (RAM),
a register, cache memory, semiconductor memory devices, magnetic
media such as, but not limited to, internal hard disks and
removable disks, magneto-optical media, and/or optical media such
as CD-ROM disks, and/or digital versatile disks (DVDs). A processor
in association with software may be used to implement a radio
frequency transceiver for use in a WTRU, terminal, base station,
RNC, and/or any host computer.
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